Elenco Upgrade Kit SC100 to SC750 - Manual (Page 217)

Straighten and
bend paperclip
-76-
Project #672
OBJECTIVE: To show how electricity can lift things using
magnetism.
Paperclip Oscillator (IV)
OBJECTIVE: To show how electricity can
lift things using magnetism.
Take a paperclip and straighten it out, bend it in
half, and place it into the electromagnet (M3)
center. Turn on the slide switch (S1), and set the
adjustable resistor (RV) control lever to the right.
The paperclip gets sucked into the center of the
electromagnet and stays suspended there. Move
the adjustable resistor lever to the left, and the
paperclip falls.
Now for the fun part: slowly slide the adjustable
resistor lever until you find a spot where the
paperclip is bouncing up and down. The LED
(D1) flashes and the speaker (SP) makes a
clicking sound.
Drop in
Project #673
OBJECTIVE: To learn how electricity and
magnetism are related.
Oscillating
Compass
Use the circuit from project #672, but replace
the 100
μF capacitor (C4) with a 3-snap wire
and replace the speaker (SP) with the 6V
lamp (L2). The circuit works the same way,
but the lamp flashes like a strobe light.
Project #674
Use the circuit from project #672, but replace
the 100
μF capacitor (C4) with a 3-snap wire and
replace the speaker (SP) with the 6V lamp (L2).
Place the iron core rod in the electromagnet
(M3) and don’t use the bent paperclip. Slide two
paperclips together, using their loops.
Turn on the slide switch (S1) and hold the
paperclips just above the electromagnet, without
them touching the iron core rod. Watch how the
lower paperclip is drawn toward the iron core
rod. Notice that the lower paperclip is vibrating,
due to the changing magnetic field from this
oscillator circuit. Compare this circuit to project
#665 (Paperclip Compass).
Paperclip
Oscillator (V)