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Series-Parallel Circuits - Engineering

Q1:

On which of the following voltage range settings will a voltmeter present the minimum load on a circuit?

A 1 V

B 50 V

C 500 V

D 1,000 V

ANS:D - 1,000 V

@All.

A voltmeter's setting is made in terms of Ohm/V.

So, for sensitive circuits, the voltmeter will draw minimum current when its resistance is maximum which will be for V=1000V available in options.

For example, if Voltmeter sensitivity is 1000 Ohm/V then for 1000 Volt, its resistance will be 1000 * 1000 = 1000000 Ohm and it will draw negligible current.
That's it.