 # Difference Between Ammeter and Voltmeter

Ammeter and voltmeter both devices are used in an electrical circuit to measure different aspects of electricity. Among them, ammeter gives you the measure of current while voltmeter helps in calculating the voltage or potential difference between two points in an electric circuit.

What is Ammeter and Voltmeter?

Ammeter – It is an instrument which is used to measure the current in an electrical circuit. It gets its name from Ampere which is the unit of electric current.

Voltmeter – This instrument measures the voltage between two points in an electrical circuit. It is present in both, digital and analogue form.

What is the Difference Between Ammeter and Voltmeter?

There are two ways to measure electricity

1. Using current

2. Using voltage

Ammeter and voltmeter are used to measure the flow of current and the measure of voltage, respectively. The significant difference between these two devices lie in its use. Further, look at the table below to understand the difference between an ammeter and a voltmeter.

 Ammeter Voltmeter Use The flow of current is measured using this instrument. Voltage or potential between two points in an electric circuit is measured using this device. Connection The electrical circuit element is connected in series with an ammeter. The electrical circuit element is connected in parallel mode with a voltmeter. In Terms of Resistance The resistance of an ammeter is low so that it does not affect the flow of current in a circuit. Since it is used to measure the difference in potential between two points, voltmeters have high resistance. Accuracy of Ammeter and Voltmeter It measures the flow of current accurately. It is less accurate with the measurement. Range of Ammeter and Voltmeter It is not possible to decrease the range of an ammeter. However, it can be increased by connecting a shunt (or low resistance) in parallel with the Ammeter. A voltmeter can have a maximum range of 0-20 V. One can increase its range by connecting resistors in series with it, and it can be reduced by connecting resistors in parallel. Ideal Case An ideal Ammeter is supposed to have zero resistance, even though it is not practically possible. In an ideal voltmeter, the current is zero and resistance is infinite. Ideal resistance of voltmeter and ammeter is infinity and zero respectively. Representation ‘A’ denotes an ammeter. ‘V’ is used to denote voltmeter.

Mentioned above are a few significant differences between Ammeter and Voltmeter. Both instruments are present in analogue and digital forms. Analogue metres have a pointer which depicts the measurement whereas digital devices display the value of current or voltage in the screen.

Multiple-choice Questions

1. Current is Measured using _______ by Connecting it in _______ with the Electric Circuit.

1. Voltmeter, series

2. Voltmeter, Parallel

3. Ammeter, Series

4. Ammeter, Parallel

Ans: c

2. Digital Meters are Preferred Over Analogue Meters.

1. True

2. False

Ans: a

3. An Ideal Voltmeter can be Considered as a _________ Circuit.

1. Power

2. Infinite

3. Short

4. Open

Ans: d

4. An Ideal Ammeter can be Treated as a __________ Circuit.

1. Open

2. Short

3. Infinite

4. Power

Ans: b

Subsequently, it is imperative to learn the various concepts of Physics so that you can define ammeter and voltmeter and other such instruments, along with their proper use. To ease your learning, Vedantu provides quality study material prepared by expert and professional tutors. You can refer to our study materials and get in-depth knowledge about the topic quickly.

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1. How to Connect Ammeter and Voltmeter in a Circuit?

Ans. Ammeter is connected in series with the circuit element whereas voltmeter is connected in parallel with the electrical circuit element. Both are used as measuring instruments for electricity, and can help in various calculations by evaluating the value of current and voltage in a circuit.

2. Why is Ammeter Connected in Series?

Ans. Ammeter is connected in series to obtain maximum current flow in the electric circuit. This is possible because its internal resistance is very low. Hence, the flow of current in the circuit can be measured with accuracy.

3. Why is Voltmeter Connected in Parallel?

Ans. If the voltmeter is connected in series with the circuit element, then the potential difference between two points will be zero because they lie in the same line. Also, the high internal resistance of voltmeter is used for evaluating the potential difference between two points.