FUN DAMENTALS FOR THE BEGINNER
WHAT A RESISTOR DOES
Basically, a resistor restricts electron flow. It acts just like a funnel does for water. A resistor allows a certain amount of
electrons to flow, depending on the voltage (pressure). By doing this experiment, you will see that the higher the value in
ohms of a resistor, the fewer the amount of electrons that will flow; thus, the
dimmer the LED will be.
1. Build the Circuit.
Using the schematic along with the pictorial diagram, place the
components on a solderless breadboard as shown. Verify that your
wiring is correct.
2. Do the Experiment.
Theory: In this simple experiment, we will light up an LED
(light-emitting diode) with a battery. The
electrons will flow out of the battery
through the LED, through the resistor, and
back to the battery. Remember, a resistor
gives opposition to the flow of electrons.
So, the more electrons that flow, the
brighter the LED will light up. The fewer
the electrons flowing, the dimmer the
LED will be.
Procedure: Connect a nine-volt battery
to the battery snap and begin touching the
probe (wire 2) to each resistor lead, one at
a time. Observe the brightness of the LED.
You should see it get dimmer as you go from R1 to R5.
BLACK hole 20f
red + - black
W1 = 1a and 11b
W2 = 19j and leads on resistors
W3 = 1d and 1i