Physics for IGCSE & O level - Electricity (Section 7 - No. 50)
If the voltage in a circuit is doubled and the resistance remains the same, what happens to the power?
The power doubles
The power is halved
The power increases by a factor of four
The power remains the same
คำอธิบาย
Since P=V^2/R, when voltage doubles, the power increases by a factor of four.