Elenco Snap Circuits Motion - Manual (Page 46)

Project 70 Color Brightness
Adjuster
Project 71
Red or Yellow
Brightness
Adjuster
Use the preceding circuit but replace
the color LED (D8) with the red/yellow
bicolor LED (D10, oriented in either
direction).
Build the circuit and turn on the slide switch (S1).
Move the lever on the adjustable resistor (RV2) to vary
the brightness of the light from the color LED (D8).
Project 72
Red & Yellow
Brightness Adjuster
Modify the preceding
circuit to match this one.
With the slide switch
(S1) on, use the
switcher (S6) to set the
color of the red/yellow
bicolor LED (D10) and
use the adjustable
resistor (RV2) to set the
brightness.
Project 73
Double Brightness
Adjuster
Turn on the slide switch (S1) and adjust the brightness of both LEDs (D8
& D10) using the lever on the adjustable resistor (RV2). You can flip D10
around to change its color from yellow to red.
-45-
Resistors are used to control or limit the flow of
electricity in a circuit. Higher resistor values reduce the
flow of electricity in a circuit.
In this circuit, the adjustable resistor is used to adjust
the LED brightness, to limit the current so the batteries
last longer, and to protect the LED from being damaged
by the batteries.
What is Resistance? Take your hands and rub them
together very fast. Your hands should feel warm. The
friction between your hands converts your effort into
heat. Resistance is the electrical friction between an
electric current and the material it is flowing through.
The adjustable resistor can be set for as low as 200W,
or as high as 10,000W (10kW).
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