Why is it necessary to connect ammeter in series and voltmeter in parallel?

Question

Please justify well.

Answer 1

you will get no variation inreading while connecting ammeter in series and voltmeter in parallel.

Answer 2

Both are basically galvanometers that sense the flow of charge. An ammeter has to capture the flow of current, all the current, so you have to put it in series. Voltmeter measures the potential difference. So we connect it across the lines between which we want to measure the voltage. It has a large resistance, the current flowing through it is a small value and is proportional to the voltage.

Answer 3

It's really quite easy. Connecting them the other way will affect the measurement in both cases.

If you consider the meter to be a resistor, what will be the effect of putting into the circuit? The desired effect is to have NO effect upon the desired measurement. Series resistors change the voltage and parallel resisters change the current.

Answer 4

Ammeters are measuring current, therefore, the current has to pass THROUGH the ammeter in order to get measured.:
http://en.wikipedia.org/wiki/Ammeter

A voltmeter measures potential differences, and is therefore connected across the potential to be measured.:
http://en.wikipedia.org/wiki/Voltmeter

In actuality, of course, a voltmeter is actually measuring the current that passes through its input impedance