What do the letters on a capacitor mean?
The letter represents the voltage rating according to the table below. The first two numbers represent the value in picofarads, while the third number is the number of zeroes to be added to the first two. For example, a 4.7 μF capacitor with a voltage rating of 25 volts would bear the marking E476.
What is the function of a capacitor in a fluorescent lamp?
Fluorescent lamps form an inductive load on the AC mains supply. As a result large installations of such lamps suffer a poor power factor and resultant voltage drop. Adding a capacitor to each lamp corrects the power factor bringing it back close to unity (1.0).
What is the use of capacitor in sodium Vapour lamp?
Metallised polypropylene film capacitors are designed to compensate the inductive idle current drawn by discharge lamps (fluorescent lamps, high-pressure mercury vapour lamps, high-pressure sodium vapour lamps and metal halide lamps with a ceramic discharge tube) in 50 Hz/60 Hz grids.
What does J mean on a capacitor?
j is the imaginary number, used in this case to sort out reactance and impedance from pure resistance. This is because the reactance of a capacitor is a leading reactance. That means that the current leads the voltage across it by 90 degrees.
What does 223 mean on a capacitor?
In This Article
| Marking | Capacitance (pF) | Capacitance (ìF) |
|---|---|---|
| 222 | 2,200 pF | 0.0022 ìF |
| 472 | 4,700 pF | 0.0047 ìF |
| 103 | 10,000 pF | 0.01 ìF |
| 223 | 22,000 pF | 0.022 ìF |
What is the difference between a ballast and a capacitor?
A transformer changes the amperage and / or voltage. It literally “Transforms” electrical energy. A ballast is like a capacitor. The electrical ballast stores energy in the same way that a water ballast stores water for stability.
Is a fluorescent light ballast a capacitor?
Ballasts vary greatly in complexity. They may be as simple as a resistor, inductor, or capacitor (or a combination of these) wired in series with the lamp; or as complex as the electronic ballasts used in compact fluorescent lamps (CFLs) and high-intensity discharge lamps (HID lamps).
What is the function capacitor?
The primary purpose of capacitors is to store electrostatic energy in an electric field and where possible, to supply this energy to the circuit. To prevent a dangerous failure of the circuit, they allow the AC to move but block the flow of DC.
Which ballast is used in sodium lamp?
Operation. The inductive ballast is made up of a coiled wire. The coil creates a magnetic field inside when a current is applied. It stores the energy of the current in the magnetic field it creates.
What does J impedance mean?
The letter J in complex impedances is called the J operator. In a resistor the voltage across the resistor and the current through it are in phase, there is no phase difference. The impedance of a resistor is called a real impedance. A capacitor is also a imaginary impedance.