Elenco Green Projects - Manual (Page 58)

-57-
5V
+
+
Remote Heater
Project #89 Heavy Fan
Build the circuit as shown, with the water
wheel on the motor. Set the meter (M6) to the
5V setting. Blow on the water wheel, aiming
the air into the “curves” on the fan. Watch the
meter to see the voltage produced, and the
red LED (D1).
If you blow on the opposite side of the fan
curves, the fan will not spin as easily. The
yellow LED (D5) will light if you blow hard
enough.
The water wheel was
made to use with
water, but wind can
push it too.
Project #90
Build the circuit as shown, with the motor (M6) on the pivot and
the wind fan on the motor. Set the meter (M6) to the 50mA
setting. Blow on the fan or place it in a strong wind. This circuit uses wind power to heat a 47 Ω resistor in the pivot
stand. The resistor is getter warmer, but you will not notice it
through the plastic case. The meter measures the current.
You can replace the motor with the solar cell (B7, red wire to “+”
side) to heat the resistor using sunlight.
Most of the energy used to make electricity eventually becomes
heat. Many computers and TVs have fans to circulate the air to
prevent components from overheating. LEDs convert some of the
electricity to light, and the rest becomes heat. The radio and horn
convert some electricity to sound waves, and the rest becomes
heat.
You can help to heat your home by putting a windmill on your
roof and using it to heat a resistor in your living room.
Electricity is great for transporting energy. Here electricity is used
to move energy harnessed from the wind to the resistor where it
is used. The electrical transmission lines in your neighborhood
transport the electricity from a power plant to your home.
50mA