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Question

Which of the following electrical component is not a measuring device?
  1. Rheostat
  2. Ammeter
  3. Voltmeter
  4. Ohmeter


Solution

The correct option is A Rheostat

A rheostat is an adjustable resistor used in applications that require the adjustment of current or the varying of resistance in an electric circuit. 
An ammeter is an electrical device used for measuring electric current in an electric circuit.
A voltmeter is an electrical device used for measuring potential difference in an electric circuit.
An ohmmeter is an electrical device used for measuring resistance in an electric circuit.

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