17 HW 16 webassign.net/web/Student/Assignment-Responses/submit?dep 18192729 he a

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17 HW 16 webassign.net/web/Student/Assignment-Responses/submit?dep 18192729 he amount of energy might correspond to what a small office uses in a working day, taking int power requirements (not just lighting). In general, resistive devices can have variable power o on how the circuit is wired. Here, power outputs were specified, so such considerations were y. Exercise 17.6 Hints: Getting Started I I'm Stuck (a) How many Christmas tree lights drawing 5.00 W of power each could be run on a circuit operating at 1.20 x 102 V and providing 15.4 A of current? lights (b) Find the cost to operate one such string 24.0 h per day for the Christmas season (two weeks), using the rate $0.10/kWh. ints SerEssen1 17 P 029. many 101 W lightbulbs can you use in a 126 V circuit without tripping a 13 A circuit breaker? (The bulbs are ence across each lightbulb is 126 V.) bulbs points SerCP7 17.P.032 lectrical energy costs 12 cents, or $0.12, per kilowatt-hour, then what would the following events cost? (a) Burn a 40 W light bulb for 24 h straight.

Explanation / Answer

Part A:

Total power of circuit will be:

P = V*i

P = 120*15.4 = 1848 W

Suppose n lights can be powered by above circuit, then

P = n*P1

P1 = power of each light = 5 W

1848 = n*5

n = 1848/5 = 369.6 = 369 lights

Part B

Power = 1848 W

time = 2 weeks = 14 days = 336 hr

Energy = power*time

E = 1848*336 = 620928 W-hr

1 kWh = 1000 W-hr

E = 620.928 kWh

Price of 1 kWh = $0.10

Price of 620.928 kWh = 620.928*0.10 = $62.1

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