Why can't we use a galvanometer directly for the measurement of voltage?

Since Galvanometer is a very sensitive device. If a low value of current pass through the galvanometer, then it may burn of explode. Therefore, it is converted into voltmeter by connecting the coil of the galvanometer with a low resistance in parallel combination ammeter is made. While current is directly proportional to Voltage by Ohm's Law.

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Because Galvanometer is used to detect electric current not voltage.

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