Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

What is short Circuit Voltage?Short-circuit voltage definitionThe secondary winding of the transformer is shorted, the primary winding is added to the supply voltage, at this time, when the secondary winding flows through the rated current, the voltage value measured at both ends of the primary winding.Uk%=Ur/Ue ×100%Physical meaningShort-circuit voltage is an important characteristic parameter of transformer, which is the basis for calculating the equivalent circuit of transformer and analyzing

What is short-circuit Current?Short circuit current definitionShort-circuit current is the current flowing through the power system when an abnormal connection occurs between phase and phase or between phase and ground (or neutral line) during operation. The value can be much greater than the rated current and depends on the electrical distance between the short circuit point and the power supply.Type of short circuit Three-phase short circuit Two-phase short circuit Single to ground short circu

What is a Glow Starter?Glow starter definitionThe spark starter is a glass bubble filled with neon gas, static contact plate, moving contact plate, bimetal plate, etc., used to preheat the fluorescent lamp filament, and increase the voltage at both ends of the lamp to light the automatic switch of the lamp.Extender part of opener: CapacitorCapacitive action: The role is to absorb the harmonics generated by glow discharge, so as not to affect the normal operation of TV, radio, audio, mobile phone

What is an Inductive Ballast?Inductive Ballast definitionInductive Ballast is an iron core inductance coil, the nature of inductance is that when the current in the coil changes, it will cause a change in magnetic flux in the coil, resulting in induced electromotive force, and its direction is opposite to the direction of the current change, thus hindering the current change.Working principle of Inductive BallastWhen the 220V 50Hz AC power supply is applied in the switch closing circuit, the cur

What is an Electronic Ballast?Electronic Ballast DefinitionElectronic Ballast is a kind of Ballast, refers to the use of electronic technology to drive the electric light source, so that it produces the required lighting electronic equipment.Working principle of Electronic BallastThe power supply is converted into a DC power supply after passing through a radio frequency interference (RFI) filter, full wave rectification, and a passive (or active) power factor corrector (PPFC or APFC). Through t

What is a Ballast Resistor?Ballast definitionA ballast resistor is a resistor used to limit the current in a circuit and prevent overcurrent faults.Ballast role To maintain the stability of the circuit Compensate for changes and protect other components of the networkClassification of ballasts Inductive ballast Electronic ballastBallast application Used in the ignition system of automobiles Lighting system

What is a Pull-up Resistor?Pull-up resistance definitionA resistor used in an electronic circuit to ensure the known voltage state of a signal.Basic structure of pull-up resistorWorking principleOn the wire to which the pull-up resistor is connected, if the external component is not enabled, the pull-up resistor "weakly" pulls up the input voltage signal. When the external component is not connected, the external "looks" high impedance to the input. At this time, the voltage at the input port ca

What is Light Dependent Resistor?Photoresistor definitionPhotoresistor is a kind of semiconductor device based on internal photoelectric effect, and its resistance value depends on the change of incident light intensity. With the increase of incident light intensity, the resistance value of photoresistor decreases, the incident light weakens, and the resistance value of photoresistor increases. The photoresistor has no polarity, and an external voltage in any direction is applied at both ends wh

What is a Variable Resistor?Variable resistor definitionResistor whose resistance can be adjusted as needed. It is a common component in electronic circuits that allows current or voltage to be adjusted according to Ohm's law.Basic structure of variable resistorA variable resistor usually has three terminals: two fixed terminals at the end of the resistance track and one removable terminal (cursor). Depending on how the terminals are connected to the circuit, a variable resistor can be used as a

What is a Cylindrical Capacitor?Cylindrical capacitor definitionA cylindrical capacitor is defined as a capacitor with a central conductor, an insulating layer, and an externally grounded metal cover.Basic structure of cylindrical capacitorIt is generally composed of two metal electrodes, an insulating medium and a shell.Working principle of cylindrical capacitorThe property of a capacitor to store electrical energy. When the capacitor is connected to the power supply circuit, ‌ after the chargi