Resonance of voltages occurs in an electrical circuit that includes several elements: a power source, an inductor and a capacitor. The listed elements are connected in series. In this case, the voltage source has a frequency that coincides with the inner loop. This is often used in bandpass filters.
In modern realities, it is difficult to imagine a house or apartment where there is no light and no electrical appliances are used. Today, electricity is an indispensable component of a comfortable human life. But often there is no stable voltage in the networks. The power supply can be either single-phase or three-phase. In the second case, residents often use a 3-phase voltage stabilizer.
Solving problems in the field of electronics and electrical, you have to deal with various calculations. Most often they are associated with the simplification of electrical circuits. For this, the equivalent method is used, when a part of the circuit is replaced by one element with characteristics similar to it. But in order to do this, you need to know how to calculate the resistance of a circuit section and what types of connections are.
When repairing an electronic device or operating electrical circuits, one has to face the need to measure the voltage and current of a circuit. For this, there are both special devices and universal ones. Using them is not difficult at all, but for this you should have at least the simplest idea of how to use them.
The first discoveries related to the work of electricity began in the 7th century BC. The philosopher of Ancient Greece Thales of Miletus revealed that when amber rubbed against wool, it was subsequently capable of attracting lightweight objects. From Greek "electricity" is translated as "amber". In 1820 André-Marie Ampere established the direct current law. In the future, the magnitude of the current strength, or what the electric current is measured in, began to be denoted in amperes.
Despite numerous scientific experiments and theoretical calculations, scientists still do not know which current is more dangerous. The inexplicability of some manifestations of electricity, despite long-established protection and prevention measures, continues to lead to injury and death. But most experts are inclined to believe that alternating current is still more deadly than direct current.
The presence of a protective device in the electrical circuit is the key to the safe use of the electrical network. For example, the stabilizer prevents equipment breakdown in the event of a short circuit, the RCD reacts to the leakage current. To protect the high-voltage network, there is a special device - a 3-phase voltage relay.
The current passing in the conductor has a certain electromotive force. When it becomes necessary to determine its value on a separately selected section of the circuit, a voltage meter is used. The unit of measurement is considered to be a volt, and the device is called a voltmeter. This apparatus is widely used in industry, research and everyday life.
Car batteries can be discharged during vehicle operation, making it impossible to start the car engine. You can avoid such problems with the help of timely service and control of the battery charge, which allows you to recharge the battery or change it to a new one. It is not difficult to measure the battery capacity with a multimeter, so every car owner can handle such a simple diagnosis.