Aceiling fan uses 0.45 kwh of energy in 6 hours. what is the power rating of the fan? a) 0.075 w b) 2.7 w c) 13 w d) 75 w

The power is defined as the energy used divided by the time :

where E is the energy and t the time.
In our problem, the energy used is E=0.45 kWh=450 Wh while the time is t=6 h, so the power used by the fan is