Difference Between Ammeter and Voltmeter

There are two ways to measure electricity, one is by measuring current where ammeter is being used and another by measuring the voltage where voltmeter is being used. Both of these devices are used in electric circuits but the major difference between voltmeter and ammeter is ammeter comes in handy for measuring the flow of current whereas the voltmeter comes in handy for measuring the voltage or emf across two points in an electric circuit.

Difference Between Ammeter and Voltmeter

Difference Between Ammeter and Voltmeter

The ammeter is used from measuring small amount of current and the result is displayed in milliamperes when it is kept in series with the circuit to be measured so that the entire current in the circuit is passing through it.

Voltmeter is parallely connected with the electric circuit in order to measure the potential. Both the devices has same connection polarity which is the negative potential is joined with the negative polarity and positive terminal is joined with the positive polarity of the supply.

Difference Between Ammeter and Voltmeter
Ammeter Voltmeter
It is used to measure current It is used to measure voltage across two points
Resistance is low Resistance is high
It is connected in series with the circuit and its accuracy is more It is connected in parallel with the circuit and its accuracy is less
Changing of range is not possible Changing of range is possible
For ideal ammeter, the value of resistance is 0 For ideal voltmeter, the value of resistance is approximately infinity
It is denoted by a symbol A It is denoted by a symbol V

These were some difference between ammeter and voltmeter. If you wish to find out more, download BYJU’S The Learning App.

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Frequently Asked Questions – FAQs

Why an ammeter is connected in series while a voltmeter is in parallel?

An ammeter is connected in series because the internal resistance of an ammeter is very low. When it is connected in series, the maximum current is allowed to flow through the circuit. When the current flow through the circuit is maximum it becomes easy to measure the accurate current. When the ammeter is connected in parallel there are chances of short circuit.

A voltmeter is connected in parallel because the internal resistance of a voltmeter is very high and it is used for measuring the potential difference between the two points. When it is connected in series, there won’t be enough flow of current due to high resistance. Also, this results in a potential difference to be zero.

What should a voltmeter have high resistance and an ammeter a low resistance?

The resistance of a voltmeter should be high because it is connected in parallel with the load and this makes sure there is no flow of current through it. While an ammeter should have a low resistance so that there won’t be many alterations in the current flow and it is connected in series which allows maximum flow of current through the circuit.

What are differential voltmeters?

A differential voltmeter is defined as the voltmeter which is used for measuring the difference between the known and unknown voltage sources. A differential voltmeter is also known as potentiometer voltmeter because the working principle of the differential voltmeter is similar to that of the potentiometer. AC differential voltmeter and DC differential voltmeter are the two types of voltmeters.

What is the testing voltage range for a voltmeter?

The testing range for a voltmeter is 500 volts.

What is digital voltmeter?

A digital voltmeter is defined as an instrument which is used for measuring the electrical potential difference between two points in a circuit. The voltage could be either alternating current or direct current. Pulse generator, voltage control and gating, counting clock pulses, analog to digital conversion, and latching and display section are the five functional sections of a digital voltmeter.

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