Elenco Electronics Snap Circuits - Bulb & Relay; Relay Buzzer

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Project #353
OBJECTIVE: To make a relay buzzer.
When you turn on the switch (S1), you should hear a buzzing sound
from the relay (S3). The sound is caused by the relay’s contacts
opening and closing at a fast rate.
Relay Buzzer
Project #352
OBJECTIVE: Light a bulb using a relay.
Turn off the slide switch (S1). If you press switch (S2), the bulb (L2)
will not light. Turn on switch (S1) and press switch (S2) again; the bulb
lights. The relay (S3) and bulb can be powered as long as the switch
(S1) is turned on.
Bulb & Relay