The power supplied to a typical black-and-white television set is90 W when the s

Question

The power supplied to a typical black-and-white television set is90 W when the set is connected to 120V. (a) How much electrical energy does this setconsume in 1 hour?
1 J

(b) A color television set draws about 2.1 A when connected to 120 V. How much time isrequired for it to consume the same energy as the black-and-whitemodel consumes in 1 hour?
2 min (a) How much electrical energy does this setconsume in 1 hour?
1 J

(b) A color television set draws about 2.1 A when connected to 120 V. How much time isrequired for it to consume the same energy as the black-and-whitemodel consumes in 1 hour?
2 min

Explanation / Answer

Power is in Watts and is the energy consumed in Joules/Secondfound with, so 1W = 1J/s, so: -- Part a: -- Energy consumed in 1 hour 1 minute = 60 seconds 1 hour = 60 minutes -- Energy Consumed = 90W(60)(60) Energy Consumed = 324000 J = 3.2 x10^4 J -- -- Color television: I = 2.1 amps V = 120 v -- P = V*I P = 120*2.1 P = 252 Watts = 252 J/s -- Time to consume same power as black an white set: -- t = 324000/252 t = 21 min -- -- Hope this helps.

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