Which of the following devices help to maintain a potential difference across a conductor?
A cell or battery
Instruments | Application |
A cell or battery | To apply a potential difference between two ends of a conductor |
Ammeter | To measure the current flowing in the circuit |
Galvanometer | To measure electric current |
Rheostat | To change the resistance as required and thereby control the current |
Voltmeter | The potential difference between two points in the circuit is measured through it |
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