Physics for IGCSE & O level - Electricity (Section 7 - No. 9)
If the voltage across a resistor is doubled, and the resistance stays the same, what happens to the power dissipated by the resistor?
The power is halved.
The power is doubled.
The power is quadrupled.
The power remains the same.
Explanation
Power (P) = V^2 / R. If V doubles, P quadruples.