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:
[tex]1Kw=1000 w[/tex]
Therefore, 4000 Watts [tex]=\frac{4000}{1000}=4Kw[/tex]
Now, we can find how many kilowatt-hours (Kw-hrs) of energy are used by the oven.
Energy used by the oven [tex]=4 \times 5=20[/tex] Kw-hrs
Therefore, 20 kilowatt-hours (kw-hrs) of energy are used by the oven.
