①Three-phase alternating currentIn power transmission, the AC power output by the power station is high-voltage three-phase power. After the electricity is distributed …
Parallel DC circuit parameters, constant current source and shunt circuit
1.The rules for calculating parallel circuit parametersThe rules for calculating parallel circuit parameters are summarized as follows:(1) The total current (IT) is …
Basic knowledge of parallel circuit
Figure 1 shows a parallel circuit with three branches. Each current path is a branch. The current from the power supply is …
Basic knowledge of series DC circuit
People often connect ordinary batteries and photovoltaic cells (solar cells) in series to increase the power supply voltage, and resistors in series …
Knowledge of inductors and component testing
(1) InductorThe inductor (see Figure 1 and Figure 2) is an electronic component composed of a wire coil. When current passes through …
Principles and application knowledge of capacitors
A capacitor is an electronic component with special properties. It can first “store” electrons, and then release them into the circuit to …
Basic knowledge of resistors
All electrical circuits have resistance. There is resistance to “resist” current in conductors, loads, and other components. There is an electronic component …
How to calculate the power of the power system?
The unit of measurement for electrical power is watts (W). Power reflects the rate at which the circuit consumes energy or the …
Diagnosis of fault circuit in electrical system
Technicians and electricians often need to troubleshoot faulty systems. Two common faults are open circuit and short circuit. Ammeters, voltmeters and ohmmeters …
How to choose the range and Ohm’s law for the meter?
①Select the range of the instrumentWhen using an analog voltmeter or analog ammeter, the most accurate reading should be near the middle …