Physical concepts and devices

When you have problems turning on a mobile device, be it a smartphone or the remote control, first of all, change its battery - battery or battery. But you can verify the operability of the energy source, and not replacing it. To do this, you just need to know how to check the battery for compliance with its characteristics using a multimeter, and then decide on its replacement.

The varistor is used in radio electronics and is installed to ensure the protection of devices from power surges. Its resistance can vary and depends on the voltage supplied to the device, varies in the range from 100 megohms to 10 ohms. How varistors work, their principle of operation, basic characteristics and parameters - if desired, a non-specialist can also understand these issues.

In everyday life, situations often arise when it is necessary to measure the voltage in the network or check the wire for breakdown. To solve these problems, a voltage tester is used. Modern devices have wide functionality and are called multimeters. However, for a person who is not professionally involved in electrics, a simpler device will suffice.

Soldering people know that it needs solder and flux. Most of them use rosin and liquid formulations as the second component. Not everyone knows why soldering fat is needed, which significantly improves the quality and speed of work.

Not so long ago, modern compact devices came to help motorists instead of a control light. One of the popular models of digital multimeters is the DT 832. Instructions for use are included in the kit, it must be studied before use. The device runs on batteries, has a small size, low cost.

When repairing or designing a new building, it is necessary to analyze electrical systems. To do this, you must be able to work with various measuring quantities, for example, represent amperes in kilowatts. In a home network, the voltage practically does not change, but you still need to know about the limits of the electric voltage, because it is taken into account when connecting devices of different capacities.

The causes of losses in electrical circuits are the presence of inductance and capacitance in them, which generate reactive power. At the same time, only part of the total power, the active component, does useful work. The reactive component is to create magnetic fields, heat the wiring and increase the load on the network. To prevent losses in the networks, reactive power compensators are installed.

To control the parameters of the electric network, various measuring devices are used. The ammeter of alternating current is a special device that allows you to recognize the amperage.

On electric motors there is a plate in which the main technical characteristics of the unit are indicated: power, speed, etc. However, manufacturers do not talk about such a parameter as inrush current. This is an important characteristic that has a significant impact on the operation of the power unit. A good electrician should be able to determine this indicator, and know what to do with the obtained values.

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