Question

If four bulbs of 50 W each for six hours, three tube lights of 40 W each for 8 hours, a

TV of 100 W for six hours, a refrigerator of 300 W for 24 hours are used. Calculate the

electricity bill amount for a month of 30 days. The cost for unit is Rs. 2.50​

Answer 1

Step-by-step explanation:

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Answer 2

Case 1
Power of bulb=50 W=(50/1000)=(1/20)KW
Time=6hrs(t)
Electrical energy of one bulb=P*t
=1/20*6
=6/20=0.3 KWh
=0.3 units
Electrical energy of four bulbs=0.3*4=1.2 units

Case 2
Power of tube lights=40W=(40/100)=2/5 KW(P)
Time=8 hrs(t)
Electrical energy of 3 tube lights =3*P*t=3*(2/5)*8
=48/5=9.6 KWh=9.6 units

Case 3
Power of a TV=100 W=(100/1000)=(1/10) kWh (P)
Time=6 hrs(t)
Electrical energy of a TV=P*t=1/10*6
=6/10=0.6 KWh =0.6 units

Case 4
Power of a refrigerator=300 W=(300/1000)=(3/10) KWh (P)
Time=24 hrs
Electrical energy of a refrigerator=P*t
=3/10*24
=72/10=7.2 KWh
=7.2 units
Total electrical energy=1.2+9.6+0.6+7.2=18.6 units
Electrical energy for a month of 1 day=18.6 units
Electrical energy for a month of 30 days=18.6*30
=558 units
Electricity bill amount for 1 unit of electrical energy=₹2.50
Electricity bill amount for 558 units of electrical energy=2.5*558
=₹1395