A particular wire has a resistivity of 2.9 x 10 m and a cross-sectional area of 5.5 x 106 m². A length of this wire is to be used as a resistor that will receive 49 W of power when connected across a 20-V battery. What length of wire is required? km

A particular wire has a resistivity of 2.9 x 10 m and a cross-sectional area of 5.5 x 106 m². A length of this wire is to be used as a resistor that will receive 49 W of power when connected across a 20-V battery. What length of wire is required? km

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter9: Measuring Instruments

Section: Chapter Questions

Problem 5PP: 5. A digital voltmeter indicates a voltage of 2.5 V when 10 of current flow through a resistor....

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Concept explainers

Power Measurement

According to Blondel's theorem, the total power is measured with one less number of wattmeters than the number of wires present in the system. So, a single-phase and two-wire system will require one wattmeter and a single-phase and the three-wire system will require two wattmeters, and a three-phase and the three-wire system will also require two wattmeters and a three-phase and the four-wire system will require three wattmeter devices. The wattmeter is a device that measures power using one voltage and one current input as shown in the above figure. Multiple current or voltage input pair cables are used by many power analyzers and digital storage oscilloscopes (DSOs) for measuring watts, in effect within a single instrument acting as multiple wattmeters. It is possible to measure three-phase and four-wire power with one correctly specified power analyzer.

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A particular wire has a resistivity of 2.9 x 108 22 m and a cross-sectional area of 5.5 x 10-6 m². A length of this wire is to be
used as a resistor that will receive 49 W of power when connected across a 20-V battery. What length of wire is required?
km

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