Per14_exercise

# Per14_exercise - Solutions to Period 14 Exercises E.1...

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Solutions to Period 14 Exercises E.1 Household wiring (120 volts) is usually divided into several fused circuits, each with a fuse or circuit breaker that blows when the current exceeds 15 amps. If you operate a 250 watt TV, a 1000 watt iron, and two 100 watt bulbs all at once from one circuit, how much power is being used? a) Less than 1000 watts b) 1350 watts c) 1450 watts d) More than 2000 watts Total Power = sum of the power drawn by the appliances = 250 W + 1,000 W + 2 (100 W) = 1,450 W E.1 = c 14-Ex 1

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E.2 In question E.1, what is the total current being drawn by these appliances from the 120 volt line? Will the 15 amp fuse blow? a) Less than 10 amps; fuse does not blow. b) About 12 amps; fuse does not blow. c) About 13 amps; fuse does not blow. d) More than 18 amps; fuse blows. Solve P = I V for I: I = P = 1450 W = 12 A V 120 V E.2 = b 14-Ex 2
E.3 You are standing in wet shoes on a damp concrete floor that has a resistance of 10,000 ohms. If you touch the hot side of a 120 volt line with wet hands, about how

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## This note was uploaded on 06/11/2011 for the course PHYSICS 103 taught by Professor Staff during the Spring '10 term at Ohio State.

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Per14_exercise - Solutions to Period 14 Exercises E.1...

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