A galvanometer has an ‘O’ mark at the middle, while a voltmeter and ammeter has the mark at the left hand corner of the dial. Explain.



A galvanometer is used to know the direction of flow of current in a circuit. Current can enter or leave through any of its terminals, therefore it has just an ‘O’ mark at the middle and no +/- signs at its terminals.

On the other hand, Ammeter and Voltmeter measure the current and voltage in the circuit, respectively. Therefore, the + sign marked at the left hand corner indicates that current must enter through this terminal.

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