Question

why ammeter is connected in series and voltmeter in parallel? please explain.

Answer 1

i) The internal resistance of the ammeter is very low.If we connect it in series, then          
     the maximum current can flow through it. So the accurate current should be
     measured. If we connect it in parallel then the accurate current can’t be 
     measured.

(ii) The internal resistance of the volt meter is very high and it is used to measure the    
     potential difference between the two points. If we connect it in series, then
     there is no flow of current in the circuit because  of high resistance. And no use       
     of connecting it in series because the potential difference between  two points 
     on the same line is zero 

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