Voltmeter

November 1, 2021

Any person who works with electricity must know the properties of the voltmeter, as it is an essential element for the knowledge of the electrical characteristics of any circuit.

Even if you are not a lover of electricity, it is always important to know these instruments because you do not know when the opportunity to use them may present itself.

In the same way, if you are studying a related career or work in this sector, it will be more than necessary for you to know a little more about all the typology, functionality, characteristics and other aspects of the voltmeter that can help you to function better in your work area.

What is a Voltmeter?

The voltmeter is a measuring instrument that is responsible for calculating the difference that exists in an electrical potential between two points or what you will surely have heard as voltage, which is represented through volts.

The voltmeter itself measures both positive and negative currents , since both are important in order to determine this differential in electric potential.

This instrument also has the ability to make these measurements in both alternating and direct current. It differs from other devices by calculating the current when it passes through a resistance.

What is a voltmeter for?

The voltmeter is an instrument that has an infinite number of functions, which makes it an essential instrument in any electrical procedure. Among the most prominent are:

  • It performs highly accurate measurements on a wide variety of devices that operate on electrical current.
  • As I mentioned earlier, it is responsible for measuring voltages or potential differences.
  • They measure the voltage equally if there is direct current or alternating current.
  • It allows to calculate the continuity of the electric current .
  • When you need to measure the flow through a resistance, it is to be expected that in addition to the voltage, it will calculate the resistance of the circuit.
  • It allows you to test the capacity of the batteries.
  • In addition to measuring resistances, they can measure electrical transistors.

Among other things, there are definitely many tasks that you can accomplish using this instrument.

How does a voltmeter work?

The voltmeter has a series of internal components that allows it to translate the signals that arrive together. Through mathematical equations encoded in its internal circuit, it can deduce any of the parameters for which it was designed such as voltage, resistance.

To make the measurement, it has two cables, one of them will be connected to the positive end, while the other will be connected to the negative end.

Next, the voltage meter is placed in the place of action and it is expected that the voltmeter, through its resistance and its signal generators, send the information to the screen, which by an analog or digital system reveals the exact measurement. of the circulating voltage.

Uses of the Voltmeter

The uses of the voltmeter are extensive and can vary according to the needs that arise at any given time.

Many people use it to test the voltage of a particular circuit, appliance technicians use it equally to test these characteristics before, during and after on the electrical appliances they are repairing.

Electricity specialists always carry one of them with them, to be able to make measurements at all current points and determine if there is voltage and how the positive and negative poles are.

It can be said that this device is extremely simple and safe to use, if you have the opportunity, try using it and make small-scale measurements of any electrical system so that you become familiar with it.

Voltmeter Types

Voltmeters have a very varied classification, they have many functions and a quite interesting historical trajectory, which among many other aspects has generated the diversity of types that you can find today, mainly:

  • According to the operating mechanism

The operating mechanism is the way the data is obtained and processed, once the volts of the current reach this instrument, you will find:

    • Analog voltmeters:

They are those that use a system of needles on a measurement scale to make the measurement, which is propelled by different internal forces translated, to be interpreted by it.

    • Digital voltmeters:

They are the most widely used today, as they are easier to interpret and have a smaller margin of error because they use a higher technology that displays numerical results on a screen.

    • Electromechanical voltmeters:

In this case, in order to make the measurements of the volts, this instrument includes in its internal mechanism a galvanometer , which is dual used for both direct and alternating current.

    • Vector voltmeters:

They are responsible for working with the waves emanating from a microwave, this model is one of the least known.

  • According to the type of current

This is a very important point, many models of voltmeters specialize in a particular type of current , although there are others that can work perfectly with both.

    • DC voltmeters:

In this case, the voltmeters are responsible for measuring circuits that work with this current, it must be remembered that it is a linear current that does not present variations in terms of flow.

    • Alternating current voltmeters:

In contrast, this type of voltmeter is exclusive for circuits that use alternating current.

    • Dual Current Voltmeters:

They are those that can work perfectly with both types of current, this is the most used model.

  • According to the degree of specialization

It refers to the functionalities and specificity that it has to carry out certain jobs in different areas.

    • Moving coil voltmeter:

This model bases its operation on a signal that generates an internal magnetic field, which is capable of promoting the rotary movement of a coil that in turn drives the needle to move on the scale.

    • Iron voltmeter in motion:

In this case, we are not working with a coil but with the movement of an iron, which is moved by the forces of attraction and repulsion that are handled internally.

    • Rectifier Voltmeter:

It is responsible for measuring the rectified voltage generated by a device called a rectifier in any type of current .

Although the list seems endless, the truth is that there are other models, which are joined with other components to cover other specific functions.

Characteristics of a Voltmeter

Due to the diversity of types that exist, the voltmeter also has an important number of characteristics that define it, since it is a multifaceted and multifunctional instrument. The main features are:

  • The unit of measurement used by the voltmeter as its name implies are the
  • In order for you to identify a voltmeter from other devices with similar physical characteristics, you have to locate a “V” enclosed in a circle printed on the instrument.
  • Voltmeters differ in the maximum capacity they can measure, we find some for small intervals and others for industrial scales.
  • The voltmeter can be included in a multimeter, however this device as such is more efficient than the multimeter to make the corresponding measurements.
  • Voltmeters regardless of the current flowing must be installed in parallel, never in series.
  • If you do not know the maximum current of the circuit to avoid damage to the devices, it is advisable to look for a large capacity voltmeter.

It is necessary to know them in order to understand how it is capable of performing all the functions described above and to reach numerous fields of production and research .

Importance of the Voltmeter

The importance of this instrument lies in the fact that it allows to know this potential difference in an electrical circuit, which is important for those who study, engineer or experiment with electric current.

It is also a preventive instrument that allows knowing the volts in a circuit and allowing you to take preventive measures when manipulating said circuit or laying the foundations for the creation of new knowledge, from the physical and experimental point of view .

Dr. Loony Davis5
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Born and raised in Brussels in an English family, I have always lived in a multicultural environment. After several work experiences in marketing and communication, I came to Smart Water Magazine, which I describe as the most exciting challenge of my career.
I am a person with great restlessness and curiosity to learn, discover what I do not know, as well as reinvent myself daily, someone who is curious about life and wants to know. I enjoy sharing knowledge.
This is my personal project but I also collaborate in other blogs, it is the case, the most important web on water currently exists in the US, if you are interested you can read my articles here.

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