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Volt-box is basically a device used for
1. Measuring the voltage
2. Extending the enrage of voltmeter
3. Extending the voltage range of the potentiometer
4. Measuring power

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Correct Answer - Option 3 : Extending the voltage range of the potentiometer

Volt-box is basically a device used for extending the voltage range of the potentiometer.

The volt-ratio box measures the high voltage.

It consists of the simple resistive potential divider which has many tapping on the input side.

The volt-ratio box uses for measuring the voltage having the value higher than 1.8 volts.

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