As an electric motor’s rotor turns in close proximity to the motor windings, a bucking voltage or back electromotive force (EMF) is generated. The back EMF (BEMF) generated across the start winding is ...

In this HVAC training video program, Jim explains potential relays and their important numbers (1, 2 and 5) and also shows how to use a meter to test and troubleshoot them along with their companion ...

Relays are electromechanical devices that use a magnetic solenoid to actual a switch. When current is passed through the solenoid coil, it produces a magnetic field. The magnetic field is strengthened ...