Data Sheet

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339. Transformers
Connect points A and B with the 4-wire (4) in project #337. Hold the
magnet (7) near the reed switch (83) for a while and you will hear the re
siren. Move the magnet (7) away from the reed switch (83) and wait for a
while. You will eventually hear the re siren start breaking up and fading out.
A transformer transfers electrical energy between two or more circuits
through electromagnetic induction. Transformers are used to increase or
decrease the alternating voltages in electric power applications.
340. Inductors
Connect points E and F with a 4-wire (4) in project #337. Hold the
magnet (7) near the reed switch (83) for a while and you will hear space
battle sounds. Move the magnet (7) away from the reed switch (83)
and wait for a while. You will eventually hear the space battle sounds
start breaking up and fading out. An inductor is a passive two-terminal
electrical component that stores electrical energy in a magnetic eld
when electric current ows through it. You can think of an inductor kind
of like a capacitor, the main difference being that a capacitor preserve
voltage by storing energy in an electric eld, while inductors preserve
current by storing energy in a magnetic eld. An inductor typically
consists of an insulated wire wound into a coil around a core.
341. The Henry
Connect points G and H with a 4-wire (4) in project #337. Hold the
magnet (7) near the reed switch (83) for a while and you will hear
music. Move the magnet (7) away from the reed switch (83) and wait
for a while. You will eventually hear the music start breaking up and
fading out. The Henry is the unit of measurement for inductance. One
Henry is equal to one kilogram-meter squared per second squared per
ampere squared, or kg*m
2
/(s
2
*A
2
).
342. Faster Fade Out
Replace the 470mF capacitor (74) with the 100mF capacitor (73) in
project #332. Press the press switch (61) for a while and you will hear
the siren. Release the press switch (61) and wait for a while. You will
eventually hear the siren start breaking up and fading out. The siren fades
out sooner than in project #332 because the capacitance is smaller in
the 100mF capacitor (73) in this circuit so it discharges more quickly.
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