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?
a 0.32 kWh
b 3.3 kWh
c 1.7 kWh
d 2 kWh
The energy used by the vacuum cleaner can be calculated using the formula:
Energy = Power x Time
Energy = 0.8 kW x 2.5 hours
Energy = 2 kWh
Therefore, the correct answer is d) 2 kWh.