Measurement and Instrumentation
Alternating current is measured by

Induction ammeter
Electrostatic ammeter
Moving iron repulsion type voltmeter
Permanent magnet type ammeter

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Measurement and Instrumentation
In AC circuits, the connection of measuring instruments cause loading effect errors which may effect

 only the magnitude of the quantity being measured.
 both of above.
 magnitude, phase and waveform of the quantity being measured.
 only phase of the quantity being measured.

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