- ページ 7

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Introducing the Variable Resistor

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Turn on the Main Switch. Now, turn the knob on the Variable

Resistor. By adjusting the resistance up or down, the amount of

lower the resistance, the more electricity reaches the LED and the

brighter in gets.

Bonus Activity:

post 29. Turn on the power and turn the Variable Resister knob.

Notice what changed?

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23-6 • 5-3

Slide the Main Switch to "on". The current has to pass through

three resistors before it gets to the LED, leaving it very dim, or

even dark. Press on the Push Switch and the electricity can

bypass one of the resistors, bringing more energy to the LED

which brightens.

Release the push switch. Use the magnet to activate the Reed

Switch. Two resistors are now bypassed and the LED glows

brighter still.

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13-15-17-6 • 5-3

Turn on the Main Switch. The current must travel through the

5.1KΩ resistor (that's 5,100 ohms or the strongest resistor on the

board) before it can light up the LED. Because of the reduced

Press the Push Switch to open another path. Even though it

for current to reach the LED.

Without releasing the Push Switch, activate the Reed Switch

with the magnet. The LED will glow brighter.

Even though there are still three resistors, there are also three

separate paths for the power to get through.

CIRCUITRY KEYBOARD

5.1K

100

ELECTRONIC CIRCUIT EXPERIMENT KIT

100