Question

How much electrical energy flows through a wire in 1.4 second when the power is 1 kW?

• A. 400 J
• B. 1400 J
• C. 800 J
• D. 1000 J

Answer 1

The correct option is B 1400 J

We know that, $Power=\frac{\text{Energy}}{\text{time}}$, the SI unit of power is watt, energy is joule and time is second.

So, 1 W = 1 joule per sec and 1 kW = 1000 joule per sec.

Therefore, 1400 J electrical energy flows through the wire in 1.4 second when the power is 1 kW.