Question

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

Answer 1

The power rating of a microwave oven that uses 1.5 kJ of energy every second is 1,500 watts or 1.5 kilowatts since power is defined as the rate of energy transfer.

Step-by-step explanation:

When a microwave oven uses 1.5 kJ of energy every second, it means that the power rating of the oven is equivalent to the rate at which it consumes energy. Power is defined as the rate of energy transfer and is measured in watts (W). Since the unit kilojoules per second (kJ/s) can also be expressed as kilowatts (kW), we can convert the energy usage to determine the power rating of the microwave oven.

To find the power in watts, we use the conversion where 1 kJ/s is equivalent to 1 kW. Therefore, the microwave uses 1.5 kJ/s, which can be written as 1.5 kW. Hence, the power rating of the oven is 1,500 watts or 1.5 kilowatts

Answer 2

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=(E)/(t)`

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

The power rating of the microwave is therefore,

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