Find the bill for 10 days if 2 fans of 20 W each are used 10h / day; 2 bulbs of 40 W each are used for 8 h / day; a TV of 15W is used for 20h / day. The rate is Rs 8 / unit
Answers
Answer:
9.12rs
Explanation:
fans=2×20×10=400
bulbs=2×40×8=640
tv=1×15×20=100
total=1140W
that is 1.140kwh
1.140×8=9.120
therefore
bill is 9.120 per day
Given :
Number of fans - 2
Power consumption by each fan - 20 W
Time for which each fan is used per day - 10 hours
Number of bulbs - 2
Power consumed by each bulb - 40 W
Time for which each bulb is used - 8 hours
Power consumed by T.V - 15 W
Time for which T.V is used - 20 hours
Total number of days - 10 days
Cost of energy consumed - Rs. 8/ unit
To find :
The total cost of energy consumed
Solution:
Here the unit of electricity refers to KWh
Electrical energy consumed = Power (KW) × time (h)
Electrical energy consumed by 2 fans in one day (in KWh) = 2×20×10/1000
= 0.4 KWh
Electrical energy consumed by 2 bulbs in one day (in KWh) = 2×40×8/1000
= 0.64 KWh
Electrical energy consumed by T.V in one day = 15×20/1000
= 0.3 KWh
Total energy consumed in 1 day = 0.4+0.64+0.3 KWh
= 1.34 KWh
Total energy consumed in 10 days = 1.34 × 10 KWh
= 13.4 KWh
Total cost of energy consumed = 13.4 ×8 Rs
= 107.2 Rs
Hence the total bill for ten days would be Rs. 107.2