Question
A household has a 100 W lamp lighted for 2 hours, two 60 W lamps lighted for 4 hours and an electric fan of 50 W working for 8 hours a day. Calculate the electric units consumed each day.
Solution
Given,
A 100 W lamp is lighted for two hours.
Two 60 W lamps lighted for 4 hours.
Electric fan of 50 W working for 8 hours a day.
Now, using the formula,
A 100 W lamp is lighted for two hours.
Two 60 W lamps lighted for 4 hours.
Electric fan of 50 W working for 8 hours a day.
Now, using the formula,
Therefore,
Electric energy consumed by 100 W lamp is,
E= 100 W x 2 h
= 200 Wh
= = 0.20 kWh
Electric energy consumed by two 60 W lamps is,
E= 2 x 60 W x 4 h
= 480 Wh
=
= 0.48 kWh
Electric energy consumed by electric fan is,
E= 50 W x 8 h
= 400 Wh
=
= 0.40 kWh
Thus, total electric energy consumed each day is
T.E = 0.20 + 0.48 + 0.40
= 1.08 kWh
= 1.08 units
Electric energy consumed by 100 W lamp is,
E= 100 W x 2 h
= 200 Wh
= = 0.20 kWh
Electric energy consumed by two 60 W lamps is,
E= 2 x 60 W x 4 h
= 480 Wh
=
= 0.48 kWh
Electric energy consumed by electric fan is,
E= 50 W x 8 h
= 400 Wh
=
= 0.40 kWh
Thus, total electric energy consumed each day is
T.E = 0.20 + 0.48 + 0.40
= 1.08 kWh
= 1.08 units
