A lamp uses a 230 V mains supply and transfers 96 J of energy every second. Work out the current through the lamp. Give your answer to 1 decimal place.

0.4 A

Explanation:

From the question,

Electric power = Voltage*current

P = VI ... Equation 1

Make I the subject of the equation

I = P/V ... Equation 2

Given: P = 96 J/s, V = 230 V.

Substitute into equation 2

I = 96/230

I = 0.4 A.

Hence the current is 0.4 A