For electrical instruments, measurements of various parameters are very important, such as voltage and current flow. These two parameters are the two main ways to measure electricity. One is the measurement of the current through the Ammeter device. Another is the Voltmeter device which is useful in measuring the voltage. Therefore both of these devices are useful in the electrical circuits and instruments. But both are having some specific differences on the basis of construction as well as on the basis of working. The main difference between Ammeter and Voltmeter is that ammeter comes in handy to measure the flow of current. On the other hand, the voltmeter comes in handy for measuring the voltage as well as emf between the two points in the electric circuit.
What is Ammeter?
This term is devised from Ampere Meter. The ammeter is the measuring instruments used in electrical devices. It is in use to measure the flow of current in the circuit. It measures very precisely. The Ammeter can measure the small amount of current, even in mili-amperes or micro-amperes. For measuring the current, Ammeter is placed in the way of a series connection with the measuring circuit. This is because the whole current of the circuit can pass through it.
What is Voltmeter?
The voltmeter is a device that is very frequent in use in the electrical instruments for measuring the voltage. It is connected in parallel with the electrical circuit whose potential is to be measured. The connection polarity of the voltmeter is the same as that of the ammeter i.e. the positive terminal is connected to the positive polarity of the supply and the negative potential is connected to the negative polarity.
Difference between Ammeter and Voltmeter
                      difference between Ammeter and Voltmeter
The important difference between Ammeter and Voltmeter
| Parameter | Ammeter | Voltmeter |
| Measuring Parameter | It is useful to measure current | It is useful to measure the voltage across two points |
| Resistance Factor | The resistance is low | The resistance is high |
| Connection type | It is connected in series with the circuit and also its accuracy is more | It is connected in parallel with the circuit and its accuracy is less |
| Range | Changing of the range is not possible | Changing of the range is possible |
| Ideal constraints | For the ideal ammeter device, the resistance must be zero. | For an ideal voltmeter device, the resistance must be approximately infinity. |
| Symbol representation | Its symbol is A | It is denoted by the symbol V |
After studying the difference between Ammeter and Voltmeter, let us also study some more details.
Ammeter:
The ammeter is used from measuring a small amount of current and the result is displayed in milliamperes when it is kept in series with the circuit to be measured for flowing the entire current in the circuit through it.
Some applications of Ammeter:
- This device is easily available with different ranges in laboratories and industries.
- It is useful to measure the current flow in the house as well for its electrical instruments.
- It is also widely in use in companies having a base in manufacturing and instrumentation.
- The Ammeter is also useful with a thermocouple to check the temperature.
- Electricians are using this device to check the faults of the circuits in offices and also houses.
Voltmeter:
The voltmeter is connected in parallel with the electric circuit in order to measure the potential.
Some applications of Voltmeter:
- A voltmeter is widely in use in the electric circuitry and hardware for doing the very precise measurement.
- It measures the voltage with the surety and safety of the circuit and also its components.
- It is also useful in the circuit for debugging and hence to certify the presence of the optimal value of the required voltage.
- The Voltmeter is also in use with cathode ray tubes to ensure the accuracy of the results and measurements.
- It is useful in laboratories for experimenting and testing purposes.
FAQs about Ammeter and Voltmeter:
Q.1: What is a differential voltmeter?
Solution: The differential Voltmeter is the voltmeter which is useful to measure the difference between the known and unknown sources of voltage. Another name for this device is the potentiometer voltmeter. This is because of having a similar working principle as of the potentiometer. On the basis of AC or DC, it has two categories, AC differential voltmeter, and DC differential.
Q.2: What is the testing voltage range for a voltmeter?
Solution: The testing range of a voltmeter is 500 volts.
Q.3: What is digital voltmeter?
Solution: Digital voltmeter is the instrument which is applicable to measure the electrical potential difference between the two points in the circuit. Here, the current may be alternating current or direct current. Five functional segments of a digital voltmeter are Pulse generator, gating, counting clock pulses, analog to digital conversion, and latching.
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