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Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?
In the T.V. set, P = 250 W
Time t = 1 hr
t = 60 × 60 seconds = 36000 sec
Electrical energy E1 = P × t
E1 = 250 × 3600
E1 = 900000 J
E1 = 9 x 105 J
In heater, P = 120 W
Time t = 10 min
t = 100 × 60 seconds
t = 600 sec
Electrical energy E2 = P × t
E2 = 120 × 600
E2 = 72000 J
E2 = 7.2 × 104 J
Since, E1 > E2
So, T.V. uses more energy.
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