Which instrument is used to measure current in a circuit?

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Multiple Choice

Which instrument is used to measure current in a circuit?

Explanation:
To measure current, you place the meter in series with the circuit so that the same current flows through it. An ammeter is designed for this purpose and has very low internal resistance, so it doesn’t appreciably alter the circuit’s current or voltage. The voltmeter, by contrast, is connected in parallel across a component and has high resistance to avoid drawing current; a wattmeter measures power (voltage times current) and is used when you need to know how much power is being consumed; an ohmmeter measures resistance by applying a small current through an isolated component. Therefore, the instrument that measures current is the ammeter.

To measure current, you place the meter in series with the circuit so that the same current flows through it. An ammeter is designed for this purpose and has very low internal resistance, so it doesn’t appreciably alter the circuit’s current or voltage. The voltmeter, by contrast, is connected in parallel across a component and has high resistance to avoid drawing current; a wattmeter measures power (voltage times current) and is used when you need to know how much power is being consumed; an ohmmeter measures resistance by applying a small current through an isolated component. Therefore, the instrument that measures current is the ammeter.

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