Question

The power rating of a vacuum cleaner is 0.8 kW if you use the vacuum cleaner for 2.5 hours how much energy does it use?

Answer 1

First, we need to convert the power rating from kW to watts:

0.8 kW x 1000 = 800 watts

Now, we can calculate the energy used by multiplying the power rating by the time used:

800 watts x 2.5 hours = 2000 watt-hours

Therefore, the vacuum cleaner uses 2000 watt-hours (or 2 kWh) of energy if used for 2.5 hours.