Electrical ballast
Videos
An electrical ballast is a device placed in series with a load to limit the amount of current in an electrical circuit.
An American electronic instant start ballast for powering a variety of American T8 fluorescent lamps.
Variety of ballasts for fluorescent and other discharge lamps
A lamp starter, required with some inductor type ballasts. It connects the two ends of the lamp to preheat them for one second before lighting.
Ballast board for the ultra-high-performance lamp in a DLP projector (bottom right, outlined in red)
Power factor
Videos
In electrical engineering, the power factor of an AC power system is defined as the ratio of the real power absorbed by the load to the apparent power flowing in the circuit. Real power is the average
1. Reactive power control relay; 2. Network connection points; 3. Slow-blow fuses; 4. Inrush-limiting contactors; 5. Capacitors (single-phase or three-phase units, delta-connection); 6. Transformer (for controls and ventilation fans)
75 MVAr capacitor bank in a 150 kV substation in Belgium
Capacitor bank, consisting of three rectangular capacitors shown in the middle, on a utility pole in San Jose, CA, USA
Power triangle diagram