Question

Calculate the electricity bill of a household for a month (having 30 days) using the following details. (An electric unit costs Rs. 3.45/-)

• A. Rs. 3500
• B. Rs. 1455
• C. Rs. 1289
• D. Rs. 2797

Answer 1

The correct option is D Rs. 2797

For ceiling fans, power consumption per day: 4 fans $\times 220\text{W}$ per fan $\times 18$ H/day = $15,840\text{Wh}$ = $15.84\text{kWh}$

For LED bulbs, power consumption per day: 6 bulbs $\times 15\text{W}$ per bulb$\times 12$ h/day = $1,080\text{Wh}$ = $1.08\text{kWh}$

For TV set, power consumption per day: $250\text{W}$ $\times 8$ h/day = $2000\text{Wh}$ = $2\text{kWh}$

For stove set, power consumption per day: $1800\text{W}$ $\times 4.5$ h/day = $8100\text{Wh}$ = $8.1\text{kWh}$

Total kWh per day = $15.84+1.08+2+8.1$ = $27.02\text{kWh}$
Given, the month has 30 days.
$\therefore$Total power consumed in the month $=27.02\text{kWh}\times 30=810.6\text{kWh}$

Electricity bill = Total power consumed in one month$\times$ Cost of one electric unit = $810.6\times 3.45=$ Rs. 2796.57 $\approx$ Rs. 2797