Calculate the electricity bill amount for a month of 30days ,if the following devices are used as specified:
1)2 bulbs of 40w for 6hours
2)2 tuvelights of 50w for 8 hours
3)a TV of 120w for 6hours.
Given the cost of electricity is 2.50rps per unit.
Answers
Bulb = 0.04 X 2 X 6 = 0.48 units
Tube lights = 0.05 X 2 X 8 = 0.8 units
TV = 0.12 X 6 = 0.72
Total energy consumed = 0.48 + 0.8 + 0.72 = 2 units
Bill amount = 2.50 X 2 X 30 = rs.150
Given :
2 bulbs of 40 W runs for 6hours
2 tubelights of 50 W runs for 8 hours
a TV of 120 W runs for 6 hours.
cost of electricity is Rs. 2.50 per unit.
To Find :
The electricity bill amount for a month of 30days
Solution :
Electrical energy consumed by two bulbs in 30 days = 2×40×6×30
= 14400 watt.hour
= 14.4 KWH
Electrical energy consumed by two tubelights in 30 days = 2×50×8×30
= 24000 watt.hr
= 24 KWH
Electrical energy consumed by a TV in 30 days = 120×6×30
= 21600 watt.hr
= 21.6 KWH
As we know, 1 KWH = 1 unit, and the cost per unit is given Rs. 2.50
The total electricity bill of one month = (14.4 + 24 + 21.6) × 2.50
= Rs. 150
Therefore, The total electricity bill of one month is Rs. 150