When the insertion of a current meter increases the circuit current above that which exists without the meter present, the effect is called current meter loading.

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Quizplus · Accepted Answer

The effect is called "loading effect," but it specifically refers to the phenomenon where the insertion of a measuring device (like a voltmeter, not a current meter) into a circuit affects the circuit's operation, typically by drawing additional current and thus changing the voltage being measured. A current meter (ammeter) is designed to have very low resistance to minimize its impact on the circuit's current.

When the Insertion of a Current Meter Increases the Circuit