Relays and Solenoids
Relays and Solenoids work on the principle
of Electromagnetic Induction -
producing a magnet through the use of electricity.
Relay
A small current flow from the power source to the switch and then
to the control
circuit winding will produce a magnetic field which will pull the
contacts closed
and allow a heavy current to flow from the power source to the load.
The control
circuit winding is wrapped around a fixed iron core.
Solenoid
The solenoid uses a moveable iron core. When current
flows from the power source, through
the switch to the winding - a magnetic field is produced in the
solenoid winding. This magnetic
field causes the moveable iron core to be moved inwards and
pull the latch open.
Next - Unit One Assignment
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