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Magnetism

Important Concepts and Terms

TermDefinition
Generator Principle The movement of a magnetic field relative to a conductor creates electricity
Motor Principle The interaction of two magnetic fields creates motion
Relay Control Circuit The electromagnetic coil of wire
Relay Load Circuit A single-pole, double-throw switch
Relay Control Terminals Terminals 85 & 86
Relay Load Terminals Terminals 87A, 87, & 30
N.O. Contact Terminal 87
N.C. Contact Terminal 87A
Relay Energized Connections Terminals 30 & 87
Relay De-energized Connections Terminals 30 & 87A
Relay An electromagnetic device that uses a low current circuit to activate a high current circuit
N.O. Normally Open
N.C. Normally Closed
Primary Winding The transformer coil that carries input current to create a magnetic field
Secondary Winding The transformer coil in which the output voltage is induced
Turns Ratio It helps determine the output of a transformer based on the number of primary turns to the number of secondary turns.
Step-up Transformer An electromagnetic device in which the number of secondary turns and output voltage is greater
Step-down Transformer An electromagnetic device in which the number of secondary turns and output voltage is lower
Solenoid An electromagnetic device that changes electrical energy in to a mechanical action
Latching Relay A relay that stays energized until the main power source is removed
Magnetic Flux The invisible lines of force surrounding a magnet
Created by: jcoombes