Question

Distinguish between Ammeter and Voltmeter.

Answer 1

Hint: Ammeter and voltmeter, both the devices are connected in a circuit in order to measure the different aspects of electricity. Ammeter is used to measure the value of electric current, while voltmeter is used to measure the voltage or the potential difference between two points in a circuit.

Complete step by step answer:
There are two ways how we can measure electricity in a circuit. The first one is by measuring electric current where ammeter is being used and another one is by measuring the voltage or the voltage difference where voltmeter is being used. Both of these devices find their use in electric circuits but the major difference between the voltmeter and the ammeter is that; ammeter comes in handy for measuring the flow of electric current whereas the voltmeter comes in handy for measuring the voltage or the electromotive force across two points in an electric circuit.
Representation of Ammeter and Voltmeter in a circuit:

Table of differences between Ammeter and Voltmeter:

	Ammeter	Voltmeter
Use	It is used to measure the flow of electric current in a circuit.	It is used to measure the voltage or potential difference in a circuit.
Connection	It is always connected in series with the electrical circuit element.	It is always connected in parallel with the electrical circuit element.
Resistance	The resistance of ammeter is low so that it does not affect the flow of current in the circuit.	The resistance of voltmeter is high in order to measure the potential difference between two points in the circuit.
Range	The range of an ammeter can be changed.	The range of voltmeter cannot be changed.
Accuracy	It measures the value of electric current accurately.	It is less accurate with the measurement of potential difference.
Ideal case	An ideal ammeter is supposed to have zero resistance; however, it is not practically possible.	An ideal voltmeter is supposed to have infinite resistance.
Representation	‘A’ is used to denote an ammeter.	‘V’ is used to denote a voltmeter.

Note: The ammeter is used for measuring the value of electric current in a circuit and the result is displayed in amperes (or miliamperes, or microamperes, as per the chosen scale), when it is connected in series with the circuit so that the entire current in the circuit is passing through the ammeter. The voltmeter is connected in parallel with the electric circuit in order to measure the voltage or potential difference between two points.
The devices, ammeter and voltmeter, have the same connection polarity in a circuit, that is, the negative potential of the device is connected to the negative polarity and positive terminal is joined with the positive polarity of the supply.