Question

A certain electric circuit obeys Ohm's law. If the voltage across the circuit and the resistance of the circuit are both doubled, what will happen to the current through the circuit?

Answer 1

Answer:

Current remains constant

Explanation:

From Ohm's law we know that V=IR where V is voltage across the circuit, I is the current across circuit and R is resistance. Making I the subject of the formula then

$I=\frac {V}{R}$

When voltage and resistance are doubled then voltage will be 2V while resistance 2R hence

$I=\frac {2V}{2R}=\frac {V}{R}$