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Elenco Snap Circuits SnapMicro I Deluxe ® User Manual

Page 6

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5

The Variable Resistor

‘RV’ is really a resistor with a wiper arm that can slide from one side

of the resistor to the

other side. As the wiper moves toward either end, the resistance

between the wiper and

that end is reduced.

The Switch ‘S1’

is equivalent to a zero Ohm resistor when it is ON, and an infinite Ohm

resistor when it is OFF.

The LED (Light Emitting Diode) ‘D1’

is similar to a check valve in series with a light. Most

diodes act similar to water pipe check valves and must be installed in the correct direction for current to

flow.

Consider the water pipe check valve shown on

the right. When the piston pushes water into

the pipe the check valve opens and water

flows as shown. When the piston tries to suck

water from the pipe the check valve closes and

no current flows through the check valve.

Light is produced whenever current flows

through the LED check valve. The stronger the

current in the LED, the brighter the light. If the

LED is installed with the + symbol connected

to the negative voltage or ground the current

cannot flow and the LED will be off.

The DC Motor

converts a DC voltage to a rotation. The direction of the rotation

depends on the polarity of the voltage.

+

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