Question

Why are ammeters connected in series and voltmeters connected in parallel?

Answer 1

Voltmeter is to measure the devices voltage. This is necessary to connect voltmeter in parallel because objects in parallel experience the same potential difference whereas ammeter should be connected in series because objects in series experience the same current. Ammeter measures electric current.

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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 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.