Question:
Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?
Answer:
We know, E = P X t
where, P = 250 w, , t = 1 hr = 60 X 60 = 3600 sec
So, energy consumed by a TV set, E = 250 X 3600 = 9 x 105 Joule
For a toaster, P = 1200 w, t = 10 min = 10 X 60 = 600 sec
E = 1200 x 600 = 7.2 x 105 Joule
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