The convention for voltmeters is to use a black wire for the negative reference terminal and a red wire for the positive reference terminal. Explain why two wires are required to measure a voltage. If the wires into the voltmeter are swapped by accident, what will happen during the next measurement

The convention for voltmeters is to use a black wire for the negative reference terminal and a red wire for the positive reference terminal. Explain why two wires are required to measure a voltage. If the wires into the voltmeter are swapped by accident, what will happen during the next measurement

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

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter14: Troubleshooting Electric Control Devices

Section: Chapter Questions

Problem 32RQ

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Concept explainers

Electrical Heating Unit

The conversion of electrical energy to heat energy is known as electric heating. The heating system that converts the electrical energy to heat energy for various application is called electrical heating unit. Electricity is employed as the firing mechanism in electric heating systems, which transforms electric current to heat. Electric heaters have heating elements in the form of electric resistors.

Question

The convention for voltmeters is to use a black wire for the negative reference terminal and a red wire for the positive reference terminal.

Explain why two wires are required to measure a voltage.
If the wires into the voltmeter are swapped by accident, what will happen during the next measurement?

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