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The instruments that determine the electrical quantity to be measured directly in terms of deflection are called:
  • a)
    Absolute instruments
  • b)
    Integrating instruments
  • c)
    Secondary instruments
  • d)
    Recording instruments
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
The instruments that determine the electrical quantity to be measured ...
We can classify the instruments into two types:
1. Absolute Instruments:
  • These instruments give the magnitude of the quantity under measurements in terms of physical constants of the instrument
  • There is no necessity of calibrating or comparing with other instruments
  • Tangent Galvanometer and Rayleigh’s current balance are examples of this class
2. Secondary Instruments:
  • These instruments are so constructed that the quantity being measured can only be measured by observing the output indicated by the instrument i.e. deflection of the instrument
  • These instruments are calibrated by comparison with an absolute instrument or any other secondary instrument which has already been calibrated against an absolute instrument
  • A voltmeter, a glass thermometer, and a pressure gauge are typical examples of secondary instruments
Working with absolute instruments for routine work is time-consuming. Therefore, secondary instruments are most commonly used. Absolute instruments are seldom used except in standard institutions and laboratories while secondary instruments find usage almost in every sphere of measurement.
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