The power to a 25-watt lamp is being measured with a voltmeter and an ammeter. The voltmeter has a resistance of 14,160 ohms. The meter is connected directly across the lamp terminals. When the ammeter reads 0.206 ampere, the voltmeter reads 119 volts. 1. What is the true power of the lamp? 2, What percentage of error is introduced if the instrument power is neglected?

The power to a 25-watt lamp is being measured with a voltmeter and an ammeter. The voltmeter has a resistance of 14,160 ohms. The meter is connected directly across the lamp terminals. When the ammeter reads 0.206 ampere, the voltmeter reads 119 volts. 1. What is the true power of the lamp? 2, What percentage of error is introduced if the instrument power is neglected?

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter4: Electric Meters

Section: Chapter Questions

Problem 3RQ: What do most analog meters use to facilitate the needle movement? a. Ohms law b. a magnetic field...

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The power to a 25-watt lamp is being measured with a voltmeter and an ammeter. The voltmeter has a resistance of 14,160 ohms. The meter is connected directly across the lamp terminals. When the ammeter reads 0.206 ampere, the voltmeter reads 119 volts. 1. What is the true power of the lamp? 2, What percentage of error is introduced if the instrument power is neglected?