Data Sheet
-126-
332. Siren is Breaking up and Fading Out
Build the circuit shown and turn on the switch (62). 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. This is because the 470mF capacitor (74)
in the circuit is initially being charge when you press the press switch,
and when you release the press switch (61), the charge on the 470mF
capacitor (74) continues to power the 3-in-1 (11). But eventually the
charge on the 470mF capacitor (74) runs out and the 3-in-1 (11) is not
getting enough voltage to operate correctly. This is why you hear the
siren breaking up and fading out.
333. Potential Energy
Connect points C and D with the 1kW resistor (42) in project #332.
Press the press switch (61) for a while and you will hear gun shots.
Release the press switch (61) and wait for a while. You will eventually
hear the gun shots start breaking up and fading out. While Kinetic
energy is related to an object in motion, potential energy relates to an
object at rest in the Earth’s gravitational eld. If the object were to fall
freely it would gain kinetic energy, and this is the potential energy of the
object. Mathematically, potential energy is dened as E
p
= m*h*g where
m is the mass of the object, h is the height of the object and g is the
gravitational acceleration discussed in project #330.
334. Joules
Connect points A and B with the 4-wire (4) in project #332. Press the
press switch (61) for a while and you will hear the re siren. Release the
press switch (61) and wait for a while. You will eventually hear the re
siren start breaking up and fading out. The Joule is the unit of energy.
It is equal to work done on an object when a force of one Newton acts
on that object in the direction of its motion through a distance of one
meter.
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