Question

If a 4000 watt oven is on for 5 hours, then how many kilowatt-hours (kw-hrs) of energy are used?

Answer 1

If a 4000 watt oven is on for 5 hours, then how many kilowatt-hours (kw-hrs) of energy are used?

Solution: We are given that the oven is 4000 watt and it is on for 5 hours.

We have to find the how many kilowatt-hours (Kw-hrs) of energy are used by the oven.

We first need to convert watts into kilowatt's. We know that:

`1Kw=1000 w`

Therefore, 4000 Watts
`=(4000)/(1000)=4Kw`

Now, we can find how many kilowatt-hours (Kw-hrs) of energy are used by the oven.

Energy used by the oven
`=4 * 5=20` Kw-hrs

Therefore, 20 kilowatt-hours (kw-hrs) of energy are used by the oven.