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Equivalent Resistance of a System of Resistor

The potential...

Question

The potential difference of a circuit is doubled. By what factor does the power change in the circuit?

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Solution

P=(V^2)/R
(We didnt take P=VI because when the voltage is increased current also increases where the resistance is the constant. Aslong as the R is constant the solution is easy to calculate)
P is proportional to the square of voltage. Therefore if the voltage doubles power will square of the voltage ie 4 times.

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The potential difference of a circuit is constant. If the resistance of a circuit is doubled, then its current will become;

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Equivalent Resistance of a System of Resistor

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