Datasheet-2

Project 70:
What will happen if you remove the 2-snap wire that
connects the points marked A & B, and instead con-
nected the red jumper wire between points B & C?
(Try it.)
Nothing will happen.
Project 71:
Why is the meter current lower when the relay is
buzzing?
The current through the coil is not continuos because
relay S3 opens and closes.
Project 72:
In project 85 and others the LED only works in one
of the switcher (S6) settings, but in this circuit it
works in either the top or bottom S6 setting. Why?
Because the relay coil is producing voltage in both
directions.
Project 75:
Why is the lamp off until you push the press switch?
There is no power to the lamp untill you press S2.
Why does the lamp stay on after you release the
press switch? (Look at the explanation of how the
relay works in project 8, and note that when the relay
is on contacts 1 and 3 on the relay symbol in the
drawing are connected.)
Relay’s 1 and 3 contacts are connected so current
flows through the lamp and coli.
Project 76:
Name an appliance in your home that uses a relay
to switch lights or motors on and off.
Refrigerator
Project 85:
Decode this Morse Code message:
. . . . . . _ . . . _ _ . _ _ .
HELP ME
Project 88:
For each component, select how they work when the
electricity is reversed:
LED: A. 1 direction only B. effects unchanged
C. effects reversed
Lamp: A. 1 direction only B. effects unchanged
C. effects reversed
Motor: A. 1 direction only B. effects unchanged
C. effects reversed
Electromagnet: A. 1 direction only B. effects un-
changed C. effects reversed