Question

1.5kj of energy are used every second by a microwave oven, what is the power rating of the oven?

Answer 1

Power is the rate at which energy is consumed. When 1 J of energy is consumed in one second, the power consumed is 1 watt.

The microwave consumes 1.5 kJ of energy.

In joules, the energy consumed is 1500 J

$P=\frac{E}{t}$

Here, E is the energy consumed in time interval t.

The power rating of the microwave is therefore,

$P=\frac{1500J}{1 s} \\ =1500 W$

Thus, the power rating of the oven is 1500 W or 1.5 kW

Answer 2

Power = work/ time
Power = 1.5 kj/ 1s
Power = 1.5kW