Answered: A heating element of a hot plate on an…

A heating element of a hot plate on an electric cooking range draws 24 amperes from 240 V mains. How many kWh of energy will be consumed in one hour and 15 minutes? 7.2 O 6.0 1.2 3.2

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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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.

Question

A heating element of a hot plate on an electric cooking range draws 24 amperes from 240 V mains. How many kWh
of energy will be consumed in one hour and 15 minutes?
O 7.2
6.0
O 1.2
3.2

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