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Question

Write symbols and state functions of each of the following components in an electric circuit:

(i) key, (ii) cell, (iii) rheostat, (iv) ammeter, and (v) voltmeter.

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Solution

(i) Key
It is used to switch the current on or off in the circuit.


(ii) Cell
It acts as a source of direct current for the circuit.
Image result for cell symbol
(iii) Rheostat
It is used to control the current in the circuit. It is basically a variable resistence.
Image result for Rheostat symbol Image result for Rheostat symbol


(iv) Ammeter
It is used to measure the current flowing through the circuit.
Image result for Ammeter symbol

(v) Voltmeter
It is used to measure the potential difference between two points of a circuit.
Image result for Voltmeter symbol


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