What is the resistance of an ideal ammeter and voltmeter?

All the current being measured has to flow through the ammeter. So in order to avoid any change in the circuit caused by the ammeter, its resistance should ideally be zero.
The voltmeter measures the voltage between two points. It must be connected between those points, and in parallel with everything between them in the circuit. In order to avoid any change in the circuit caused by the voltmeter, its resistance should ideally be infinite.

Answered by AL2006 | 2024-06-10

An ideal ammeter has zero resistance to avoid altering the current it measures, while an ideal voltmeter has infinite resistance to prevent drawing current from the device it's measuring the voltage of. ;

Answered by ArmyArcherd | 2024-06-18

An ideal ammeter has a resistance of zero ohms (0 Ω) to avoid altering the current in a circuit, while an ideal voltmeter has infinite resistance to prevent it from affecting the voltage across the component being measured.
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Answered by AL2006 | 2024-10-13