Question text
33 An electric current can produce a heating effect and a magnetic effect. Which row shows the effect that a relay uses and one application of a relay? effect used by a relay one application of a relay A heating effect allowing a small current to switch on a large current B heating effect changing the voltage of an a.c. supply C magnetic effect allowing a small current to switch on a large current D magnetic effect changing the voltage of an a.c. supply
33 An electric current can produce a heating effect and a magnetic effect.
Which row shows the effect that a relay uses and one application of a relay?
effect used by a relay one application of a relay
A heating effect allowing a small current to switch on a large current
B heating effect changing the voltage of an a.c. supply
C magnetic effect allowing a small current to switch on a large current
D magnetic effect changing the voltage of an a.c. supply
Select your answer: