A relay is an electrically controlled switch&#151;one source of electricity activates an electromagnet which operates a switch which, in turn, alters the electrical flow in another circuit.
(an electromagnet; operates; a switch which, in turn, alters the electrical flow in another circuit) (a switch; alters; the electrical flow in another circuit) (one source of electricity; activates; an electromagnet which operates a switch) Context(one source of electricity activates,List([50, 85))):(A relay; is; an electrically controlled switch&#151)
one source of electricity activates,List([50, 85))
an electromagnet a switch one source of electricity A relay
operates alters activates is
a switch which, in turn, alters the electrical flow in another circuit
the electrical flow in another circuit
an electromagnet which operates a switch
an electrically controlled switch&#151