2-6 A Relay As A Switch

Front 1

an electromechanical _____ has contacts like a manual switch, but it is controlled by external voltage instead of being operated manually

Back 1

relay

Front 2

this relay is called _______ because at rest the contacts are touching or closed

Back 2

normally closed (NC)

Front 3

this relay is called _______because at rest, the contacts are not touching, they are open

Back 3

normally open (NO)

Front 4

this _______ is important in many digital applications and it is a feature that certain semiconductor switches cannot provide

Back 4

total isolation

Front 5

also, the contacts are normally rated for currents much higher than the current rating of _______

Back 5

semiconductor switches

Front 6

to energize the relay coil, the triggering device must supply several _______, whereas a semiconductor requires only a few _________ to operate

Back 6

milliamperes, micro amperes

Front 7

a relay is also much _____than a semiconductor

Back 7

slower

Front 8

the relay coil becomes _________, causing the relay contacts to close

Back 8

energized relay coil

Front 9

the relay is triggered by the ________

Back 9

clock waveform (cp)

Front 10

the _______ is placed across the relay coil to protect it from arching each time the coil is energized

Back 10

diode