3(ii)
The image given below displays kilowatt-hour meter readings recorded at two distinct points in time.
Assuming a continuously running 2000W air conditioner as the sole electrical device in use, calculate the time interval, in hours, between these two meter readings.
Show SolutionHide Solution↓
Given,
- Power rating of air conditioner (P) = 2000 W
- Initial meter reading = 856 kWh
- Final meter reading = 1567 kWh
Now,
Electrical energy used (E) = 1567 − 856 = 711 kWh
$\text{Time} = \frac{\text{Energy}}{\text{Power}} = \frac{711 \text{ kWh}}{2 \text{ kW}} = 355.5 \text{ h}$
Hence, the time interval is 355.5 h.