Question

What will be the result if a student connect voltmeter in series and ammeter in parallel in a circuit by mistake

Answer 1

Voltmeters have high resistance. When it is connected in series it decreases the current going to the circuit.

While Ammeters are very low in resistance. SO when connected in parallel the current would bypass the circuit, all go through the ammeter, and blow out the ammeter. 

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