Why ammeter connected in series and voltmeter connected in parallel? Has this question ever crossed your mind? Furthermore, if you are an electrical engineering student, then surely this is something that might entice you.
Here, in order to know why ammeter connected in series and voltmeter connected in parallel, we need to know the basics of short circuit & open circuit. Hopefully, we all know the basics.
The Basic before finding out why ammeter connected in series and voltmeter connected in parallel?
The ammeter’s internal resistance is very negligible. So, if it is kept in parallel with the circuit then it behaves like a short circuit.
Now, we will learn how it behaves. The internal resistance of the ammeter is close to zero. Now, if it is placed in parallel with a load, then the total resistance stands, 0 || R (Load) = 0.
Again, we know that the resistance of the short circuit is close to zero. As a result, the current cannot be measured but the loss of the circuit.
But in this case, it stands at 0 + R = R. Then, the load current will show in the ammeter.
Now, let’s come to the second question. The resistance of the voltmeter is too high. It is near infinity. So, if we put it in the series without putting it in parallel, then it will consume the whole voltage. As a result, it will not be possible to get perfect voltage across the load. In the end, the connection is made in parallel.
Now, the voltage drop in parallel remains the same inspite of having resistors of different values. So the voltmeter will show the voltage that the load/resistor will consume.
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Courtesy: Iqbal Mahmood