(a) An electrodynamic wattmeter is used to measure the electrical power in a circuit. The diagram in Figure Q3(a) depicts the symbol for the two types of coils in the wattmeter. M L COM Ww. Figure Q3(a) Name the two coils and explain the reason for the number of turns to be low or high for each coil, respectively. (b) An electrodynamometer-type wattmeter has a current coil resistance, ZRc= 0.5 0. Calculate the percentage error of the wattmeter reading if the moving coil is connected before the current coil for a single-phase circuit. The load is specified as 220 V with unity power factor. Let the load current, I, = 88 I, = 88 + 10 = 98A. (e) An energy meter has a constant of 60 revolutions per kilowatt-hour (kWh). Calculate the number of revolutions made by the disc in 30 minutes when measuring the energy consumed by a single-phase load carrying the same current as the I, value set in part Q3(b) above at 230V and power factor of 0.5. Express your final answer to the nearest integer.

(a) An electrodynamic wattmeter is used to measure the electrical power in a circuit. The diagram in Figure Q3(a) depicts the symbol for the two types of coils in the wattmeter. M L COM Ww. Figure Q3(a) Name the two coils and explain the reason for the number of turns to be low or high for each coil, respectively. (b) An electrodynamometer-type wattmeter has a current coil resistance, ZRc= 0.5 0. Calculate the percentage error of the wattmeter reading if the moving coil is connected before the current coil for a single-phase circuit. The load is specified as 220 V with unity power factor. Let the load current, I, = 88 I, = 88 + 10 = 98A. (e) An energy meter has a constant of 60 revolutions per kilowatt-hour (kWh). Calculate the number of revolutions made by the disc in 30 minutes when measuring the energy consumed by a single-phase load carrying the same current as the I, value set in part Q3(b) above at 230V and power factor of 0.5. Express your final answer to the nearest integer.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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