# Physical concepts and devices

The definition of the concept of current strength sounds like this: these are charged particles (electrical charges) that move in a certain direction and are called electrons.

Let's imagine that a certain amount of electricity passes through a section of the chain, for example, one pendant.

It can pass in one second, or it can take an hour. Therefore, its strength is determined precisely by the amount of electricity that passes through the conductor in a specific unit of time - a second.

Current unit

A person can get an electrical injury when exposed to natural phenomena or household electricity. The consequences may be different depending on the discharge passing through the body. Often a person's life depends on how soon first aid is provided for an electric shock. We must act quickly and correctly. For such situations, a first aid algorithm has been developed.

Electric shock

Probably, every person learned from childhood that electric current is something from which almost all devices in the house work. For many, electricity is associated with a bright lightning in the sky, and for someone - with an electrical outlet and a naive childish desire to stick a finger in it.

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Constant and variable

The three-phase power supply system is accepted as a standard in most countries of the world, Russia is no exception. Every house in the country is connected to such a network, but, as a rule, one phase wire enters a separate apartment. If desired, two more phases can be carried out, which is often done in areas intended for individual housing construction. They are needed for the operation of equipment containing an electric motor. When connected to a three-phase circuit, questions often arise related to concepts such as phase and line current, as well as the corresponding voltage indicators.

The operation of electrical devices connected to a 220 volt network is designed for this voltage with a tolerance of no more than ten percent. For electrical appliances, both undervoltage and overvoltage are dangerous.

The tester is a multifunctional device designed to measure all kinds of radio and electrical quantities. Its other name is a multimeter. The word multimeter comes from the English multimeter (functional meter) and is a complex electrical measuring device.

Digital multimeter

Zener diode (Zener diode) resembles a diode in its external resemblance. However, its functions differ from the diode in terms of the current-voltage characteristic (VAC). The Zener diode has a high resistance, but when a certain voltage is applied to it, a breakdown occurs. Because of this, the current flowing through it increases. In the breakdown mode, the voltage across the Zener diode with a wide range of currents is maintained with the specified accuracy.

To measure any electrical quantities - such a need sometimes arises for any modern person. Not to call the master every time or contact your friends when a simple malfunction occurs in everyday life? Any motorist is constantly faced with situations when it is necessary to check the supply voltage of the battery or check the integrity of the electrical fuses under the hood of the car. The purchase of a device, the name of which is a multimeter, and work with it will allow you to come closer to solving the problem that has arisen.

Any car includes an electromechanical device called a generator. In case of problems with it, car owners purchase a new device. At the same time, it is possible to repair the device yourself, which will save money.

An important part of the generator is its rectifier bridge. To carry out repairs or diagnostics, you will need to remove the generator from the car. It is easier to check the diode bridge using a multimeter.

How to check a diode bridge

#### Physical concepts and devicesMiscellaneous

Not only industrial, office, but also home electrical equipment is constantly under the threat of breakdowns, or even complete failure. The reasons for this can be both lightning discharges and fai...