If you double the voltage in a circuit, what happens to the current if the resistance remains the same?

When voltage in a circuit is doubled while maintaining the same resistance, the current also doubles. This relationship is explained by Ohm's Law, which states that Voltage (V) is equal to Current (I) multiplied by Resistance (R), or V = I × R. If you rearrange the equation to solve for current (I), it becomes I = V / R.

If you increase the voltage (V) while keeping the resistance (R) constant, the current (I) must increase proportionately. For instance, if the original voltage is V and results in a current I, doubling the voltage to 2V leads to a new current of I = (2V) / R, which simplifies to I = 2(V / R) – meaning the current now doubles.

This direct proportionality between voltage and current, given a constant resistance, effectively demonstrates that any change in voltage will equally affect the current flowing through the circuit.