Question

What is the principle of Rheostat?

Answer 1

1. The principle of Rheostat is based on Ohm's law, which states that $V=Ri$, where $V$ is the potential drop, $i$ is the current and $R$ is the resistance of wire.
2. A rheostat is a circuit component that changes the resistance of a circuit.
3. As the resistance in Rheostat increases, the current in circuit changes as value of $R$ changes causing a change in $i$.
4. Further the resistance of wire increases as the temperature increases.
5. Rheostat is used as a variable resistance which controls current by increasing or decreasing the value of resistance