The  voltmeter is an instrument designed to make estimates in volts. They are instruments that are placed in parallel , which is why their electrical resistance has to be very high. This is because the lowest possible consumption of electricity is sought when connecting the instrument with the electrical circuit. Its utilities and characteristics are quite extensive


What is a voltmeter?

A voltmeter is that instrument designed to measure the electric potential between two points in a system. It is an instrument with a high resistance to the passage of electric currents , which also differentiates it from other instruments . It is mostly used in the context of measuring the potential difference of some electronic systems .

  • History
  • What is a voltmeter for?
  • Types
  • Parts of a voltmeter
  • How does it work
  • How to use
  • How a voltmeter is connected in a circuit
  • Why is the voltmeter connected in parallel
  • How it differs from the multimeter
  • How it differs from the ammeter
  • Importance of the voltmeter


Although it is a much older instrument , the digital voltmeter finds its origins in the mind of Andrew Kay in the middle of the 20th century . This person, president of a computer company, designed a series of instruments destined to be applied in submarines and space ships, which used the same means of the analog voltmeter , but with the incorporation of electronic or digital.


What is a voltmeter for?

The voltmeter is basically designed to measure electrical voltage . This can be seen, for example, in the voltage that is supposed to run inside a system like a fan. A fan has a certain electrical potential , and in case the voltage does not reach the expectations, it could be said that the electrical system presents a problem.


Among some of the voltmeters that we can mention (and that can be easily found in the market), we have the following:

  • Electromechanical Voltmeter . They have a galvometer , which is measured through an estimate in volts. They can be used in direct or alternating currents.
  • Vector Voltmeter . It is an instrument that is used in the event that microwaves are incorporated into the system.
  • Digital Voltmeter . One of the newer types of voltmeter. They stand out from the rest because they present their readings through an LSD screen.

Parts of a voltmeter

Among some of the parts that we can mention of this instrument , we can name:

  • A positive or red input terminal.
  • A negative or black input terminal.
  • The sample or sector where the readings can be seen. This can be seen differently in both analog and digital devices.

How does it work

These instruments consist of a fairly resistant system to electricity . This is because the system to be evaluated needs the fewest possible interruptions in order to estimate with the greatest precision. Once connected to the appropriate points, the system is in charge of passing the information through a tester that, in turn, would be in charge of offering the appropriate measurements in this regard.

How to use

Its use is very simple. The input terminals should be placed at the points of the circuit that you want to study. This should also be accompanied by a readjustment of the measurement protocols (in case it is a digital voltmeter). The result has been a rough estimate of the electrical voltage of the circuit in question.

How a voltmeter is connected in a circuit

It generally , is connecting the terminal positive input to its counterpart in the electrical circuit. In the same way, the same is done at the negative input terminal.

Why is the voltmeter connected in parallel

This is because the voltmeter seeks to measure the electrical voltage present in a parallel circuit. These are circuits whose electrical current passes in two directions, the two points that make it up mutually feeding back .

How it differs from the multimeter

Their differences are mainly quantitative. While the voltmeter measures the electrical voltage present in a circuit, the multimeter has the ability to measure other quantities besides this one.

How it differs from the ammeter

The ammeter , on the other hand, measures the flow of electrical current within a circuit. This is an instrument that uses the ampere as a measure. The voltmeter , on the other hand, is limited to electrical voltage , and relies on volts to express its estimates.

Importance of the voltmeter

It is a very necessary instrument within our society. It is precisely through it that the worker can estimate to what extent a circuit does the work for which it is intended. Or if there is a problem that prevents the electrical voltage from reaching what is expected.

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