Relays consist of an electromagnet (a coil of wire wrapped around a spool) which closes an electrical circuit when power is applied.
(Relays; consist; of an electromagnet) (a coil of wire; wrapped; around a spool) (an electromagnet; closes; an electrical circuit; T:when power is applied) (power; is applied; )
Relays a coil of wire an electromagnet power
consist wrapped closes is applied
of an electromagnet
around a spool
an electrical circuit T:when power is applied