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What is the difference between AC (Alternating Current) and DC (Direct Current)?

by in Fundamental Of Electrical Engineering ago

What is the difference between AC (Alternating Current) and DC (Direct Current)?

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Direct Current (DC): The flow of electric charge is in one constant direction. Sources include batteries, solar cells, and DC power supplies. It is mainly used in electronics, charging, and low-voltage applications.

Alternating Current (AC): The flow of electric charge reverses direction periodically. It is generated by power plants and supplied to homes and industries. AC is preferred for power transmission because it can be easily transformed to higher or lower voltages using transformers, reducing energy loss.

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A battery of emf 10 V and internal resistance 3 Ohm is connected to a resistor. If the current in the circuit is 0.5 A, what is the resistance of the resistor? What is the terminal voltage of the battery when the circuit is closed?

A battery of emf 10 V and internal resistance 3 Ohm is connected to a resistor. If the current in the circuit is 0.5 A, what is the resistance of the resistor? What is the terminal voltage of the battery when the circuit is closed?
Answer : ### Given Information: * **EMF of the battery (E):** 10 V * **Internal resistance (r):** 3 Ω * **Current in the circuit (I):** 0.5 A --- ### 1. What is the resistance of the ... text{V}$ Both methods give the same result. **Answer:** The terminal voltage of the battery is **8.5 V**....

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Electrical Engineering
Voltage Controlled Current Source (VCCS) | Dependent Source | Electrical Engineering

Voltage Controlled Current Source (VCCS) | Dependent Source | Electrical Engineering

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in Electrical Circuits And Network
State the term “Phase” and “Phase difference” in case of alternating qualities.

State the term “Phase” and “Phase difference” in case of alternating qualities.
Answer : # Phase and Phase Difference in Alternating Current: Complete Guide ## What is Phase in AC Circuits? **Phase** in alternating current (AC) systems refers to the instantaneous ... between quantities of the same frequency. Different frequency components are analyzed separately in harmonic analysis....

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Electrical Engineering
Capacitor : Before charging takes place | Electrical Engineering

Capacitor : Before charging takes place | Electrical Engineering

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in Electrical Estimating And Contracting
Why is accurately estimating Indirect Costs (Overhead) and Profit just as critical as correctly calculating the direct costs of labor and material when submitting a competitive and sustainable electrical bid?

Why is accurately estimating Indirect Costs (Overhead) and Profit just as critical as correctly calculating the direct costs of labor and material when submitting a competitive and sustainable electrical bid?
Answer : This question gets to the heart of what separates a working electrician from a successful electrical contractor. While getting the direct costs right determines the *cost* of a job, getting ... reward the risk involved. All three are indispensable pillars of a successful electrical contracting bid....

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Electrical Engineering
Dynamically induced emf | Electrical Engineering

Dynamically induced emf | Electrical Engineering

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in Current Electricity
A set of n-identical resistors, each of resistance R ohm when connected in series have an effective resistance of X ohm and when the resistors are connected in parallel the effective resistance is Y ohm. Find the relation between R , X and Y ?

A set of n-identical resistors, each of resistance R ohm when connected in series have an effective resistance of X ohm and when the resistors are connected in parallel the effective resistance is Y ohm. Find the relation between R , X and Y ?
Answer : Let's break this down step-by-step to find the relationship between R, X, and Y. ### 1. Resistors in Series When resistors are connected in series, their total effective resistance is the sum of ... the **geometric mean** of the total series resistance (X) and the total parallel resistance (Y)....

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Electrical Engineering
Wye-Delta Transformations : For circuit in Fig obtain the equivalent resistance at terminals a b

Wye-Delta Transformations : For circuit in Fig obtain the equivalent resistance at terminals a b

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in Current Electricity
The storage battery of a car has an emf of 12V . If the internal resistance of the battery is 0.4 Ohm , what is the maximum current that can be drawn from the battery?

The storage battery of a car has an emf of 12V . If the internal resistance of the battery is 0.4 Ohm , what is the maximum current that can be drawn from the battery?
Answer : The maximum current that can be drawn from the battery is **30 Amperes (A)**. --- ### Detailed Explanation #### 1. Understand the Concepts * **EMF (Electromotive Force, $\mathcal{E ... even explode. This calculation is a theoretical maximum. **Never attempt to short-circuit a car battery.**...

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Electrical Engineering
Electrical Machine : Three Phase Induction Motor Problem Solved Example | Electrical Engineering

Electrical Machine : Three Phase Induction Motor Problem Solved Example | Electrical Engineering

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in Basic Electrical Engineering
What is Electric Current? A Complete Guide to the Basics

Discover the fundamentals of electric current. Learn the definition, the basic formula (I = Q/t), the difference between AC/DC, and the distinction between conventional current and electron flow.
Answer : ![][1] [1]: https://electrical-engineering.app/?qa=blob&qa_blobid=15457729789953541712 *** # What is Electric Current? A Complete Guide to the Basics Electric current is the ... industry has continued to use conventional current (positive to negative) as the standard for circuit analysis....

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Electrical Engineering
Capacitors | Electrical Engineering

Capacitors | Electrical Engineering

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in Advance Power Electronics
What are the fundamental limitations of traditional "hard-switched" PWM converters, and how do resonant or "soft-switching" techniques like Zero Voltage Switching (ZVS) and Zero Current Switching (ZCS) overcome these limitations to achieve higher efficiency and power density?

What are the fundamental limitations of traditional "hard-switched" PWM converters, and how do resonant or "soft-switching" techniques like Zero Voltage Switching (ZVS) and Zero Current Switching (ZCS) overcome these limitations to achieve higher efficiency and power density?
Answer : This question addresses the critical challenge of **switching loss**, the primary barrier to increasing the operating frequency, and therefore the power density, of modern power converters. ** ... state-of-the-art applications like server power supplies, EV chargers, and renewable energy inverters....

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Electrical Engineering
Passive Network

Passive Network

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in Engineering Graphics
What is Orthographic Projection, and what is the fundamental principle that governs the alignment of the standard views (Front, Top, and Right Side) on a 2D engineering drawing?

What is Orthographic Projection, and what is the fundamental principle that governs the alignment of the standard views (Front, Top, and Right Side) on a 2D engineering drawing?
Answer : **Orthographic Projection** is the primary method used in engineering to represent a three-dimensional object on a two-dimensional surface. The core idea is to look at the object from ... the exact 3D object it represents, making it the unambiguous foundation for manufacturing and construction....

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Electrical Engineering
MCQs on Earthing | Electrical Engineering

MCQs on Earthing | Electrical Engineering

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in mathematics-i
What is the Fundamental Theorem of Calculus, and why is it considered "fundamental" to the study of calculus?

What is the Fundamental Theorem of Calculus, and why is it considered "fundamental" to the study of calculus?
Answer : The Fundamental Theorem of Calculus is the central pillar that connects the two main branches of calculus: **differentiation** and **integration**. In essence, it rigorously proves ... This relationship is the foundation for countless applications in physics, engineering, economics, and statistics....

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Electrical Engineering
What is the capital city of Japan

What is the capital city of Japan

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in Mobile & Wireless Communication
What is the multipath fading problem in wireless communication, and how does the Orthogonal Frequency-Division Multiplexing (OFDM) modulation scheme elegantly solve this problem, which was a major limitation for previous generations of mobile technology?

What is the multipath fading problem in wireless communication, and how does the Orthogonal Frequency-Division Multiplexing (OFDM) modulation scheme elegantly solve this problem, which was a major limitation for previous generations of mobile technology?
Answer : This question addresses the single most challenging physical problem in mobile communication and the ingenious solution that underpins virtually all modern broadband wireless standards. --- ### **Part 1: The Problem - Multipath Fading and ... **4G LTE, 5G NR, and modern Wi-Fi (Wi-Fi 4/5/6/7)**....

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Electrical Engineering
How does the temperature affect the Zener voltage of a Zener diode? | Electrical Engineering

How does the temperature affect the Zener voltage of a Zener diode? | Electrical Engineering

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in Current Electricity
Three resistors 1 Ohm , 2 Ohm and 3 Ohm are combined in series. What is the total resistance of the combination?

Three resistors 1 Ohm , 2 Ohm and 3 Ohm are combined in series. What is the total resistance of the combination?
Answer : When resistors are combined in series, the total resistance is the sum of the individual resistances. The formula is: R_total = R1 + R2 + R3 Given the values: * R1 = 1 Ω * R2 = 2 Ω * R3 = 3 Ω ... = 1 Ω + 2 Ω + 3 Ω = 6 Ω So, the total resistance of the combination is **6 Ohms**....

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Electrical Engineering
Alternators MCQ | Electrical Engineering

Alternators MCQ | Electrical Engineering

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in Current Electricity
Three identical cells, each of emf. 2V and unknown internal resistance are connected in parallel. This combination is connected to a 5 ohm resistor. If the terminal voltage across the cell is 1.5 volt. What is the internal resistance of each cell? Hence define the internal resistance of a cell?

Three identical cells, each of emf. 2V and unknown internal resistance are connected in parallel. This combination is connected to a 5 ohm resistor. If the terminal voltage across the cell is 1.5 volt. What is the internal resistance of each cell? Hence define the internal resistance of a cell?
Answer : ### Part 1: Calculating the Internal Resistance Here's how we can find the internal resistance of each cell. **Given Data:** * Electromotive force (EMF) of each cell, E = 2 V * Number of identical cells ... . * **I** is the current flowing from the cell. * **r** is the internal resistance....

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Electrical Engineering
Analysis of an AC Circuit with Resistance and Capacitance | Alternating Current

Analysis of an AC Circuit with Resistance and Capacitance | Alternating Current

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in Current Electricity
In a potentiometer arrangement, a cell of emf 1.25V gives a balance point at 35.0cm length of the wire. If the cell is replaced by another cell and the balance point shifts to 63.0cm , what is the emf of the second cell?

In a potentiometer arrangement, a cell of emf 1.25V gives a balance point at 35.0cm length of the wire. If the cell is replaced by another cell and the balance point shifts to 63.0cm , what is the emf of the second cell?
Answer : ### Principle The working principle of a potentiometer is that the potential drop across any portion of a wire of uniform cross-section is directly proportional to the length of that portion, provided a constant current flows ... 2.25 V** ### Answer The EMF of the second cell is **2.25 V**....

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Electrical Engineering
What is the best way to learn a new language? | Electrical Engineering

What is the best way to learn a new language? | Electrical Engineering

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in Current Electricity
A Carbon resistor has three strips of red colour and a gold strip. What is the value of the resistor? What is its tolerance?

A Carbon resistor has three strips of red colour and a gold strip. What is the value of the resistor? What is its tolerance?
Answer : The value of a carbon resistor is determined by the standard resistor color code system. For a 4-band resistor: * **Band 1:** First significant digit * **Band 2:** Second significant ... a new resistor with these color bands will have an actual resistance somewhere between 2090 Ω and 2310 Ω....

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Electrical Engineering
BCD addition | Electrical Engineering

BCD addition | Electrical Engineering

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in Basic Electrical Engineering
What is an AC Waveform?

What is an AC Waveform?
Answer : ![][1] [1]: https://electrical-engineering.app/?qa=blob&qa_blobid=15410724103918634750 --- ### **Understanding the AC Waveform: A Complete Guide** An AC (Alternating Current) ... analyzing AC circuits and is the foundation for more advanced topics like frequency, phase, and RMS values....

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Electrical Engineering
Hindi : RL parallel circuit | Electrical Engineering

Hindi : RL parallel circuit | Electrical Engineering

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in Basic Electrical Engineering
What Is Instantaneous Value in AC Circuits?

What Is Instantaneous Value in AC Circuits?
Answer : ![][1] [1]: https://electrical-engineering.app/?qa=blob&qa_blobid=16854098827759881751 *** ### What Is Instantaneous Value in AC Circuits? Definition & Graph Explained When working with Alternating Current (AC), ... , `ω` is the angular frequency, `t` is the time, and `φ` is the phase angle....

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Electrical Engineering
Voltage | Basic Concepts | Electrical Engineering

Voltage | Basic Concepts | Electrical Engineering

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in Basic Electrical Engineering
What is an Alternating Quantity?

In the world of electronics and electrical systems, not all currents and signals are constant. Many change over time in a repeating pattern. This is known as an Alternating Quantity.
Answer : ![][1] [1]: https://electrical-engineering.app/?qa=blob&qa_blobid=7972430680887786847 *** ### Understanding Alternating Quantities & Common Waveforms: A Visual Guide In the world of electronics and ... **Amplitude:** The peak or maximum value of the wave, measured from the center line....

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Electrical Engineering
State any four advantages and four disadvantages of diesel electric power plant.

State any four advantages and four disadvantages of diesel electric power plant.

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in Basic Electrical Engineering
What is Alternating Voltage?

What is Alternating Voltage?
Answer : ![][1] [1]: https://electrical-engineering.app/?qa=blob&qa_blobid=4201262535895897867 *** ### Understanding Alternating Voltage (AC): Formula, Graph, and Key Terms Explained ... voltage circuit. These core concepts are the building blocks for more advanced topics in AC electronics....

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Electrical Engineering
Why don't we use copper in transmission lines? | Electrical Engineering

Why don't we use copper in transmission lines? | Electrical Engineering

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in Basic Electrical Engineering
What is Electromotive Force (EMF)? How is it different from potential difference?

What is Electromotive Force (EMF)? How is it different from potential difference?
Answer : ### The Water Pump Analogy Imagine a water circuit with a pump and a water wheel. * **The Pump:** The pump does work on the water, lifting it up and giving it potential energy. It's the ... from a battery if you draw no current from it. The moment you use it, the terminal voltage drops slightly....

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Electrical Engineering
Electrical Circuit Nodal Analysis | Nodal Analysis Steps | Nodal Voltage Analysis Tutorial | KCL

Electrical Circuit Nodal Analysis | Nodal Analysis Steps | Nodal Voltage Analysis Tutorial | KCL

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in Basic Electrical Engineering
What is Phase Difference?

What is Phase Difference?
Answer : ![][1] ### **Image Alt Text:** A detailed diagram explaining the concept of phase difference using waveforms and a phasor diagram. On the left, a graph shows two sinusoidal ... systems in electrical engineering. [1]: https://electrical-engineering.app/?qa=blob&qa_blobid=5143319512310161876...

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Electrical Engineering
Find Vo in the circuit in Fig. | Operational Amplifier | Electrical Engineering

Find Vo in the circuit in Fig. | Operational Amplifier | Electrical Engineering

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in DC Basics And Networks And Electromagnetic Theory
What is drift current?

What is drift current?
Answer : ### The Simple Analogy: A River Imagine a wide, slow-moving river. The water molecules in the river are like the **charge carriers** (e.g., electrons) in a wire. * **Without a ... What's the opposite?** Diffusion current, which is caused by differences in concentration, not by an electric field....

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Electrical Engineering
Find Vo in Fig. | Operational Amplifier | Electrical Engineering

Find Vo in Fig. | Operational Amplifier | Electrical Engineering

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in Basic Electrical Engineering
What is Kirchhoff's Current Law (KCL) ?

What is Kirchhoff's Current Law (KCL) ?
Answer : ![][1] [1]: https://electrical-engineering.app/?qa=blob&qa_blobid=291642859617107883 --- ### **Understanding Kirchhoff's Current Law (KCL): Definition, Formula, and Example** Kirchhoff's Current Law, often abbreviated ... = 2 A` **Answer:** The value of the unknown current is **I₅ = 2 A**....

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Electrical Engineering
Source transformation 4 | Electrical Engineering

Source transformation 4 | Electrical Engineering

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in Electrical Power Generation, Transmission And Distribution
Why is electrical power transmitted at high voltage and low current?

Why is electrical power transmitted at high voltage and low current?
Answer : Power loss in transmission lines is given by: $$ P_{\text{loss}} = I^2 R $$ where $I$ is the current and $R$ is the line resistance. * If power is transmitted at **low voltage**, ... kV) using **step-up transformers** for transmission, and then step it down near consumers for safe distribution. ...

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Electrical Engineering
Ideal Op Amp Model Solved Example | Electrical Engineering

Ideal Op Amp Model Solved Example | Electrical Engineering

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in Current Electricity
If potential difference V applied across a conductor is increased to 2V , how will the drift velocity of the electron change?

If potential difference V applied across a conductor is increased to 2V , how will the drift velocity of the electron change?
Answer : ### Short Answer If the potential difference V applied across a conductor is increased to 2V, the **drift velocity of the electrons will also double**. ### Detailed Explanation Let's ... the electric field, which doubles the force on the electrons, which doubles their average drift velocity....

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Electrical Engineering
Diode VI characteristics in hindi | Electrical Engineering

Diode VI characteristics in hindi | Electrical Engineering

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in Current Electricity
A steady current flow in a metallic conductor of non-uniform crosssection. Which of these quantities is constant along the conductor: current, current density, electric field, drift speed?

A steady current flow in a metallic conductor of non-uniform crosssection. Which of these quantities is constant along the conductor: current, current density, electric field, drift speed?
Answer : Here is a detailed explanation for each quantity: ### 1. Current (I) * **Why it's constant:** The term "steady current" implies that the rate of flow of charge ($I = dQ/dt$) is constant. Due to the ... ($v_d$)** | Not Constant | $v_d = I/(nAe)$. Since A is not constant, $v_d$ is not constant. |...

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Electrical Engineering
Equivalent Impedance Example | Electrical Engineering

Equivalent Impedance Example | Electrical Engineering

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in Current Electricity
Find the value of unknown resistance X in the circuit shown in the figure if no current flows through the section AO. Also calculate the current drawn by the circuit from the battery of emf. 6V and negligible internal resistance.

Find the value of unknown resistance X in the circuit shown in the figure if no current flows through the section AO. Also calculate the current drawn by the circuit from the battery of emf. 6V ... resistance. ![][1] [1]: https://electrical-engineering.app/?qa=blob&qa_blobid=394010198424626099
Answer : ### Part 1: Finding the value of the unknown resistance X The problem states that no current flows through the section AO. Let's label the central junction point as 'O'. 1. **Identify the Principle:** The ... resistance **X is 6Ω**. * The current drawn by the circuit from the battery is **1A**....

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Electrical Engineering
Thevenin's Theorem | Thevenin Equivalent Circuit (Easy Example) | Electrical Engineering

Thevenin's Theorem | Thevenin Equivalent Circuit (Easy Example) | Electrical Engineering

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in Current Electricity
A battery of emf E and internal resistance r sends a current, I1 , I2 when connected to an external resistance of R1 , R2 respectively. Find the emf. and internal resistance of the battery.

A battery of emf E and internal resistance r sends a current, I1 , I2 when connected to an external resistance of R1 , R2 respectively. Find the emf. and internal resistance of the battery.
Answer : Let's derive the expressions for the electromotive force (EMF) and the internal resistance of the battery step-by-step. ### Understanding the Setup The core principle we'll use is Ohm's law applied to the entire circuit. For a ... $$ **EMF (E):** $$ E = \frac{I_1 I_2 (R_1 - R_2)}{I_2 - I_1} $$...

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Electrical Engineering
Phasors | Impedance Combinations | Series parallel Circuit with Impedance RLC Circuit Solved Example

Phasors | Impedance Combinations | Series parallel Circuit with Impedance RLC Circuit Solved Example

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in DC Basics And Networks And Electromagnetic Theory
Do conventional current and electron current flow in the same direction in an electric circuit?

Do conventional current and electron current flow in the same direction in an electric circuit?
Answer : ![][1] [1]: https://electrical-engineering.app/?qa=blob&qa_blobid=13686190518983378217 The short answer is: **No, they flow in opposite directions.** Here is a detailed breakdown of why: ... what's happening inside the wire, you need to think about **electron current (negative to positive)**....

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Electrical Engineering
RA and RB are the input resistances of circuits as shown below The circuits extend infinitely in

RA and RB are the input resistances of circuits as shown below The circuits extend infinitely in

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in Thevenin's theorem
Find the Thevenin equivalent circuit of the circuit shown in Fig. to the left of the terminals a-b. Then find the current through RL = 6, 16, and 36 Ohm.

Find the Thevenin equivalent circuit of the circuit shown in Fig. to the left of the terminals a-b. Then find the current through RL = 6, 16, and 36 Ohm. ![][1] [1]: https://electrical-engineering.app/?qa=blob&qa_blobid=8797772883006435339
Answer : Solution : ![][1] [1]: https://electrical-engineering.app/?qa=blob&qa_blobid=9419660387739356857...

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Electrical Engineering
DC to AC & AC to DC | Electrical Engineering

DC to AC & AC to DC | Electrical Engineering

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in Basic Electrical Engineering
Generation of Alternating Voltage (Simple Loop AC Generator)

Generation of Alternating Voltage (Simple Loop AC Generator)
Answer : ![][1] [1]: https://electrical-engineering.app/?qa=blob&qa_blobid=8817613126340970498 *** ### **Generation of AC Voltage: A Simple Guide to How AC Generators Work** Alternating ... peak, and returning to zero is what defines **AC voltage** and creates its signature sinusoidal waveform....

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Electrical Engineering
R-L Series Circuit Analysis: Resistance, Inductance, Impedance, and Power Factor Calculation with Ex

R-L Series Circuit Analysis: Resistance, Inductance, Impedance, and Power Factor Calculation with Ex

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in Embedded System
What is a Real-Time Operating System (RTOS), and why is it frequently used in embedded systems instead of a general-purpose operating system like Linux or Windows?

What is a Real-Time Operating System (RTOS), and why is it frequently used in embedded systems instead of a general-purpose operating system like Linux or Windows?
Answer : The answer lies in one critical concept: **determinism**. While a general-purpose OS is designed for high throughput and fairness, an RTOS is designed for predictability and meeting strict timing deadlines. ... system where **failing to complete a task on time is considered a total system failure.**...

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Electrical Engineering
Source Transformation | Electric Circuits | Example 4.7 | Electrical Engineering

Source Transformation | Electric Circuits | Example 4.7 | Electrical Engineering

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