Question

Why voltmeter should be connected in parallel?

Answer 1

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★ A Voltmeter has very high resistance to ensure that it's connection do not alter flow of current in the circuit.

★ Now if it is connected in series then no current will be there in the circuit due to it's high resistance.

★ Hence it is connected in parallel to the load across which potential difference is to be measured.

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Answer 2

Ammeter:-

An ammeter is just a converted Galvanometer and measures the current flowing through the circuit by showing proportional deflection. An ammeter is formed by connecting a Galvanometer with a low resistance in parallel.

$\bigstar$So the ammeter is connected in series with the circuit elements and the measures the current flow in a circuit.

Voltmeter:-

A Voltmeter is also a converted Galvanometer which measures the amount of Voltage (or) in other words the potential difference accross two points in a circuit. A voltmeter is formed by connecting a Galvanometer in series with a high resistance.

$\bigstar$So the Voltmeter is attached in parallel in a circuit and measures the voltage in a circuit

And if this is not maintained then there is a high chance for the ammeter to get damaged due to low resistance.