Question

What will happen if we connect the voltmeter in series and ammeter in parallel

Answer 1

if we connect the volmeter in series that means we are reducing the current nearly equal to zero or in other words it will lead to an open circuit.
if we connect the ammeter in parallel we will gonna short that element and because of sorting the current increase rapidly and it can burn the circuit.

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.

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