Galvanometer as Ammeter – Rankers Physics
Topic: Current Electricity
Subtopic: Measuring Devices ( Galvanometer, Voltmeter and Ammeter & Meter Bridge )

Galvanometer as Ammeter

Assertion (A): A galvanometer can be used as an ammeter only.
Reason (R): A galvanometer can be used in electric circuit to detect the electric current only.
 
(1) Both (A) & (R) are true and the (R) is the correct explanation of the (A)
(2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(3) (A) is true but (R) is false
(4) Both (A) and (R) are false

Solution:

A galvanometer is a device used to detect small electric currents. It can be converted into an ammeter by connecting a low resistance shunt in parallel or into a voltmeter by connecting a high resistance in series. Therefore, the assertion that it can be used 'only' as an ammeter is false, and the reason that it can be used to detect current 'only' is also false. Thus, both A and R are false.

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