When both the current and voltage in a circuit are doubled, what happens to resistance and power?

1 Answer
Shwetank Mauria
Feb 23, 2016

Resistance remains same, but power becomes four times i.e. quadruples.

Explanation:

If current is #I# and voltage is #V#, then resistance #R=V/I# and power is given by #P=V*I#.

As such when both the current and voltage in a circuit are doubled, resistance becomes #R=(2V)/(2I)=V/I# and hence remains same.

However, power becomes #P=2V*2!-4V*I# i.e. power becomes four times.

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