1 Answer
The unit **ampere (A)** is the base unit of electric current in the International System of Units (SI). It doesn't have a direct "formula" like some other units (e.g., force or energy), but it can be related to other quantities through **Ohm's Law** and **electromagnetic principles**.
1. **Ohm's Law Relation**:
- The **current (I)** in a circuit can be calculated using Ohm’s Law:
\[
I = \frac{V}{R}
\]
where:
- \(I\) is the current in amperes (A),
- \(V\) is the voltage across the resistor in volts (V),
- \(R\) is the resistance in ohms (Ω).
2. **Definition via Coulomb's Law**:
The ampere can also be defined as the flow of **one coulomb of charge** per second. So:
\[
I = \frac{Q}{t}
\]
where:
- \(I\) is the current in amperes (A),
- \(Q\) is the charge in coulombs (C),
- \(t\) is the time in seconds (s).
In both these formulas, the ampere is indirectly involved, either through voltage and resistance or through charge and time.
1. **Ohm's Law Relation**:
- The **current (I)** in a circuit can be calculated using Ohm’s Law:
\[
I = \frac{V}{R}
\]
where:
- \(I\) is the current in amperes (A),
- \(V\) is the voltage across the resistor in volts (V),
- \(R\) is the resistance in ohms (Ω).
2. **Definition via Coulomb's Law**:
The ampere can also be defined as the flow of **one coulomb of charge** per second. So:
\[
I = \frac{Q}{t}
\]
where:
- \(I\) is the current in amperes (A),
- \(Q\) is the charge in coulombs (C),
- \(t\) is the time in seconds (s).
In both these formulas, the ampere is indirectly involved, either through voltage and resistance or through charge and time.