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Common Electric Meters Used in the Industry

A resource-sharing site for students and technicians to review Chapter 4 Q&A on electric meters, including voltmeters, ammeters, and ohmmeters, with practical usage tips and safety procedures in the HVAC and electrical industry.

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Chapter 4 R/QI .What are the three most common electric meters used in the industry?Voltmeter, ammeter and ohmmeter.2.Service techs should be able to use electric meters because....D) All of the above3.What do most analog meters use to facilitate the needle movement?B) A magnetic field that flowing electrons produce.4.How does an ammeter work?It uses magnetic fields to move a needle point, measures the flow of current in anelectric circuit.5.What are the two types of ammeters? What type is more commonly used in theindustry?The clamp on and the in-line. The clamp on is more commonly used.6.What is the result of the meter reading of clamping jaws of a clamp-on ammeteraround two wires?An incorrect reading.7.How can a very small ampere draw be measured with a clamp on ammeter?By coiling the wire around the jaws of the meter.8.If a conductor was wrapped around the jaws of a clamp on meter four times, theproper reading would be 4 amps if the clamp on meter was reading 16 amps.9.Explain the operation of an analog voltmeter?A device that uses a meter movement to indicate an electrical characteristic.10. Air conditioning or refrigeration equipment can operate properly at 10%above orbelow its rated voltage.I I .If a technician has no idea of the voltage available to a unit, what procedure shouldbe followed on reading the voltage?Start with the highest scale on the meter and then change the meter setting until theneedle falls midrange of the voltage scale.
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Electrical Engineering & Electronics

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