Answer

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**Hint:**As we know, an ammeter is an instrument that can measure the current in a circuit.

And, a voltmeter is an instrument that can measure the voltage in a circuit.

We have to remember that by applying Ohm’s law, the ammeter is connected in series with a circuit to measure the current passing through the circuit. And the voltmeter is connected in parallel to measure the potential difference of the two points of that circuit.

**Complete step-by-step solution:**

We also need to remember that an ammeter is an instrument that is connected in series with a circuit to measure the current passing through the circuit. From Ohm’s law, we get that $V = IR$ where, $V = $ voltage

$I = $ the current of the circuit.

And, $R = $ resistance

From this formula, the current is measured by regulating voltage with constant resistance.

A voltmeter is an instrument that can measure the voltage in a circuit i.e the potential difference between two points of a circuit. The voltmeter is connected in parallel series with the circuit.

**Additional information:**We have to remember that the galvanometer has functioned as a voltmeter when it is connected in series with a large resistance \[R\]. \[R\] is calculated by the maximum voltage measured.

**Note:**We need to know that the ammeter in the Series connection is necessary to measure current because it experiences the same current.

We must have to remember that the voltmeter in a parallel connection is necessary to measure voltage because it experiences the same potential difference.

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