Question

The electricity tariff in a town is $Rs.3.00$ per unit. Calculate the cost of running an $80W$ fan for $10h$ a day for the month of June.

• A. $Rs.\mathrm{12.00.}$
• B. $Rs.\mathrm{52.00.}$
• C. $Rs.\mathrm{72.00.}$
• D. $Rs.\mathrm{92.00.}$

Answer 1

Answer: (C)

$Rs.\mathrm{72.00.}$

Total time for which the fan is used $=\left(10hours\right)\times \left(30days\right)=300$ hours.
Energy consumed $=\left(80W\right)\times (300$ hours$)$
$=24,000Wh=24kWh.$
But $1kWh=1$ unit.
Therefore, $24kWh=24$ units
The cost of this power $=24$ units $\times Rs.3=Rs.\mathrm{72.00.}$