A device that measures electrical current

We use many electrical devices in our daily lives, which in electrical engineering science requires defining processes to measure electrical currents, to know the degree of efficiency, and the working mechanism of these devices used. The ammeter is the device  that  is used to measure electrical current, and the origin of the word ammeter goes back to the word ammeter. “Meter” is related to the idea of ​​measurement in general, as the meter is the basic tool through which one can know the measurement of the quantity of something, or its length.

Therefore, the unit in electrical current depends on the ampere, as a unit of measurement of current intensity essentially, and it is the unit that measures current, and the efficiency of the current itself. It is also considered a unit of measurement of electrical current in the international system in general, and specialists and technicians have paid attention Applying the laws of electric current intensity, and searching for what is called how the electric current intensity is calculated.

In general, current is the process by which electrons flow, and it is considered the basic process in the ammeter device , which measures the flow of electric current represented by electrons, and it is the ampere scale for measuring electric current, and the difference between what is called an ideal current meter, and what It is called an ammeter because the first has no resistance, but the second practically has a small internal resistance, and specialists in the field of electronics and electric current have confirmed that measuring the speed of the electric current or the degree of the electric current depends on the basic value of the resistance.

This is the basic element that is used as a standard, to differentiate between the types of amperage meters, and ampere measurement depends on what is called symbolic representation, which is symbolized by the symbol A, which is considered a unit of measurement for electric current in an electrical circuit, and this process also depends on the conduction of current. Electrophoresis in an electrical circuit in the form of a series.

Where the electrons pass through the entire current that was measured, then what is called a loss of energy occurs in the process of measuring the electric current due to the current meter and the internal resistance. One of the most important features of the current meter is that the internal resistance is reduced, and its result is the occurrence of what is called a decrease in electrical voltage. In the circle in a small way.

The types of ammeters depend on the classification process. There is an ammeter that depends on a group of basic factors, the most important of which is the flow design to measure current. There is a classification that depends on the construction where permanent electric current passes, in the form of coils. There are two basic types for measuring alternating current: Measuring direct current, the first type is called AC ammeter, and the second type is AD ammeter, and they measure these two types of electrical currents represented by “direct current (DC)” and alternating current (AC), where direct current sends a current in one direction, while alternating current By switching the direction of the current at regular intervals. The ammeter is generally considered the most widely used instrument for measuring current. Since the SI unit for measuring electric current is the ampere, the instrument used to measure current is called an ammeter.

Ammeter and its types

There is a big difference between what is called an ammeter and a voltmeter, as the latter is based on measuring the difference between two voltages, the first voltage, which is the electrical load, and the source voltage, and this device is based on parallel connection and the electrical circuit is closed.

There are a number of basic elements in measuring electric current, through which we can determine and measure the quality of this ammeter. There is a meter for electric current that relies on permanent magnetic coils, and there is a type for measuring electric current called MI. In general, electrical measurement depends on Type of rectifier in measuring electric current.

Electronics specialists have classified ammeters into a number of types, the most important of which is K

• PMMC Ammeter which is connected between the pole of the permanent magnet, when a current flows through the coil, which deflects, and the PMMC Ammeter is used to measure direct current.
• The second type is called Ammeter MI, which is an ammeter connected to the moving coil. It is intended for measuring alternating current and direct current, as they move freely between the poles of a permanent magnet and are then deflected to a certain angle.
• Electro-dynamometer Ammeter, which is the third type, is specialized as an electrical dynamic measurement, used to measure between alternating current and direct current, and the difference between it and other meters is the high accuracy in this device compared to the first two types of measuring electrical current, as it is used to measure alternating current, and with it An instrument called a correction instrument, which measures the direction of the current, and this type of measure is often relied upon in communications.

The effect of temperature on ammeter devices

The temperature in the ammeter, which is based on the ampere unit, is considered an instrument or device with high sensitivity, which is greatly affected by the degree of current that is exposed to heat, and is often affected by the ambient temperature, which may lead to inefficiency of its work and inaccuracy in the reading. It always gives false readings, and the rectifier is present in these devices. It is also affected by temperature, and is connected in series with the ammeter. The ammeter also contains a dedicated fuse in order to protect the current from extreme temperature increases, which This device may be affected by high temperature, which may affect the fuse.

What is the name of the device that measures electric current?

The basic elements in an ammeter to measure electric current

One of the basic elements of an ammeter by determining the ampere is resistance, as it is considered essential, as the resistance must be of a low level, and it must contain a low amount of voltage, and there are two types of connection in ammeter devices, which depend on the connection Through parallel, and connection through series. If one relies on connection through parallel, in which all the current flows through the meter, due to the high current, this may lead to the device burning, while connection in series is the basic idea in installing an ammeter to measure current. The electrician.