Before carrying out repair or installation work in electrical installations up to 1000 V, it is necessary to make sure that there is no current from the supply network and on the conductors. For this, low voltage indicators are used. The principle of their operation differs, and the design also changes. A mistake in determining the presence of a charge will cost the user dearly, it is important to test the tool in a timely manner. Compliance with the rules for using the pointer is the second component of safety.
Industrial facilities and shopping centers cannot function without electrical equipment. Because of this, there is a need to classify rooms with increased danger, which allows for appropriate control. Safety standards, rules for handling electrical equipment and actions in the event of dangerous situations must be studied by specialists working in production.
The directional movement of charged particles under the action of an electric driving force (EMF) is called an electric current, it is variable and constant. In the latter case, the movement of nucleons is stable in time, and in the first case, it periodically reverses the direction and magnitude. One of the main parameters of alternating current is frequency. The characteristic depends on the frequency of oscillations of electrons, it can be measured in several ways and with instruments.
When working with electronics and wires, it is often necessary to measure constant and variable amperage, voltage, resistance and other network parameters. In order not to buy a bunch of different equipment for this, a multimeter was invented. This small and easy-to-use appliance can be connected and used by any amateur electrician at home.
A diode is a semiconductor device that plays an important role in various electrical and electronic devices. It rectifies alternating currents and detects high frequency modulated signals. The zener diode stabilizes due to its characteristics. There are several ways to test a zener diode with a multimeter.
The main tool of the radio amateur is a soldering iron. It is a small device used for soldering and tinning. It easily allows you to create a permanent connection and a reliable electrical contact. There are a large number of such products, differing in both design and principle of operation, so it can be difficult to choose a soldering iron, even if the required characteristics are determined.
Various integrated circuits can often be found in electronic devices. One of them is the comparator. Its applications range from signaling sensors to industrial and automotive electronics. Knowing how the comparator works, you can independently assemble various interesting circuits, for example, a charger, an indicator unit, or even a generator.
To obtain seams on copper products, they usually do not use welding, but soldering. This is due to the fact that when heated, the metal combines with oxygen and hydrogen, as a result copper oxide is formed, leading to the appearance of numerous cracks and a deterioration in the strength of the seam connections. Soldering copper does not require highly sophisticated equipment, since this process can be done at home on your own.
A system of three sinusoidal currents that change over time and have a phase shift is called three-phase alternating current. With the help of this system, convenient and economical electric motors are created, electricity is transmitted over long distances, the material consumption of transformers and power cables is reduced. The operation of all large power plants and electricity consumers is based on three-phase current.
