What is internal resistance and ideal voltmeter?

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Solution

The ideal voltmeter is a theoretical concept of a voltmeter that does not influence the circuit, because the current to the ideal voltmeter is zero.

Internal resistance usually means the electrical resistance inside batteries and power supplies that can limit the potential difference that can be supplied to an external load.

The internal resistance of an ideal voltmeter is infinity and the internal resistance of an ideal ammeter is zero.

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