Physics for IGCSE & O level - Electricity (Section 11 - No. 29)
If a device uses 100 watts of power and is connected to a 230V supply, what is the current?
0.43 A
1.0 A
2.3 A
10 A
Maelezo
Using the formula Power = Voltage x Current (P=VI), rearranging gives I = P/V, therefore Current = 100W / 230V ≈ 0.43A