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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?
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The instruments that determine the electrical quantity to be measured ...
We can classify the instruments into two types
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
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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The instruments that determine the electrical quantity to be measured directly in terms of deflection are called:a)Absolute instrumentsb)Integrating instrumentsc)Secondary instrumentsd)Recording instrumentsCorrect answer is option 'C'. Can you explain this answer?
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