Question 18.
Solve the example.
Who will spend more electrical energy? 500 W TV Set in 30 mins, or 600 W heater in 20 mins?
Answer:
We know Energy spent = P x t
Where P = power
t = time
in case of tv set
P = 500 W
t = 30 minutes = 1/2 hour
so, energy spent = 500 x 1/2
= 250 Wh
In case of heater
P = 600 W
t = 20 minutes = 0.33 hour
so, energy spent = 600 x 0.33
= 198 Wh
Hence TV set spent more electrical energy.
