The power supplied to a typical black-and-white television set is 96 W when the

Question

The power supplied to a typical black-and-white television set is 96 W when the set is connected to 120 V.

The power supplied to a typical black-and-white television set is 96 W when the set is connected to 120 V. (a) How much electrical energy does this set consume in 1 hour? Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. J (b) A color television set draws about 2.8 A when connected to 120 V. How much time is required for it to consume the same energy as the black-and-white model consumes in 1 hour?

Explanation / Answer

a)

Energy = Power * Time

where energy is in joules, power in watts and time in seconds.

E = 96W * 3600 s
E = 345600 J

[ 345.6 kJ ]

b)
Power used by color set = 120 v * 2.6 A = 312 W

Time = Energy / Power = 345600 / 312
Time = 1107.69 s = 18.46 minutes

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