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Ammeters And Voltmeters
Question
You are provided with one low resistance RL and one high resistance RH and two galvanometers. One galvanometer is to be converted to an ammeter and the other to a voltmeter. Show how you will do this with the help of simple, labelled diagrams.
Solution
To convert a galvanometer to ammeter:
To convert galvanometer into voltmeter:
Question
i) A galvanometer with a resistance of 75 Ω produces a full scale deflection with a current of 5 mA. How can this galvanometer be converted into an ammeter which has a range 0 - 5A?
ii) Explain the statement: temperature coefficient of resistance of a metal is 4 x 10-3/ 0C.
Solution
i)
Given,
Galvanometer Resistance, RG = 75 Ω.
Current on galvanometer, ig= 5 mA
Range of current, = 0 to 5 A
We know, 
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Mock Test Series
Mock Test Series