1 Answer
Resistance is a property of a material that opposes the flow of electric current. When electric current passes through a conductor (like a wire), the atoms in the material cause some resistance, which makes it harder for the electrons (that carry the current) to move through.
Think of it like water flowing through a pipe. If the pipe is narrow or rough inside, itβs harder for the water to flow, just like how a material with high resistance makes it harder for electric current to flow.
The unit of resistance is Ohms (Ξ©), and it depends on factors like:
In a simple formula, resistance \(R\) is related to voltage \(V\) and current \(I\) by Ohm's Law:
\[
R = \frac{V}{I}
\]
This means that resistance equals the voltage across a component divided by the current flowing through it.
Think of it like water flowing through a pipe. If the pipe is narrow or rough inside, itβs harder for the water to flow, just like how a material with high resistance makes it harder for electric current to flow.
The unit of resistance is Ohms (Ξ©), and it depends on factors like:
- Material: Some materials (like copper) have low resistance, while others (like rubber) have high resistance.
- Length: The longer the material, the higher the resistance.
- Cross-sectional area: Thicker wires or materials have lower resistance.
- Temperature: As temperature increases, the resistance usually increases too.
In a simple formula, resistance \(R\) is related to voltage \(V\) and current \(I\) by Ohm's Law:
\[
R = \frac{V}{I}
\]
This means that resistance equals the voltage across a component divided by the current flowing through it.