a) Is a wattmeter required to measure the real power delivered to a resistive load? (b) A wattmeter will indicate zero when the current lags (or leads) the voltage by 90 0 . (c) An incandescent lamp, rated at 100 W, gives a certain amount of light when placed across the 120 V ac power line. Would the amount of light increase, decrease or remain the same, when the lamp is placed across a 120 V dc power line? Explain your answer.

a) Is a wattmeter required to measure the real power delivered to a resistive load? (b) A wattmeter will indicate zero when the current lags (or leads) the voltage by 90 0 . (c) An incandescent lamp, rated at 100 W, gives a certain amount of light when placed across the 120 V ac power line. Would the amount of light increase, decrease or remain the same, when the lamp is placed across a 120 V dc power line? Explain your answer.

EBK ELECTRICAL WIRING RESIDENTIAL

19th Edition

ISBN:9781337516549

Author:Simmons

Publisher:Simmons

Chapter27: Service-entrance Equipment

Section: Chapter Questions

Problem 32R

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