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

Using the formula Power = Voltage x Current (P=VI), rearranging gives I = P/V, therefore Current = 100W / 230V ≈ 0.43A