The power supplied to a typical black-and-white television set is82 W when the s

Question

The power supplied to a typical black-and-white television set is82 W when the set is connected to 120 V. (a) How much electrical energy does this setconsume in 1 hour?
1 J
(b) A color television set draws about 2.7A when connected to 120 V. How much time is required for it toconsume the same energy as the black-and-white model consumes in 1hour?
2 min (a) How much electrical energy does this setconsume in 1 hour?
1 J
(b) A color television set draws about 2.7A when connected to 120 V. How much time is required for it toconsume the same energy as the black-and-white model consumes in 1hour?
2 min

Explanation / Answer

(a)   energy = power * time = 82 W * 3600s =295.2 kJ (b)   power = V i = 120 * 2.7 = 54 W                 time =energy / power = 295.2 X 10 3 / 54 = 5466.67 s = 1.52 h= 91.1 min

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