Three LEDs in a Series Circuit

Materials

• Breadboard
• 1 9V Battery
• 1 Battery Clip
• 3 LEDs (Any color)
• 1 330 Ohm resistor
• Jumper Wires
• Momentary Switch

Procedure

1. Connect your positive and negative terminals to the respective power rails. Do not attach the battery just yet.
2. From the positive rail, connect a wire to A4.
3. Connect a 330 Ohm resistor from B4 to B7. The polarity of the resistor does not matter.
4. With all your LEDs, bend the anode (long leg of the LED that is positive) to form a curved figure that equals the size of the cathode (short leg of the LED that is negative.
5. Connect the first LED’s anode to C7 and cathode to C10.
6. Connect the second LED’s anode to E10 and cathode to E13.
7. Connect the third LED’s anode to C13 and cathode to C16.
8. To close the circuit, connect a wire from A16 to the negative terminal.
9. Attach your battery.

Adding in a Switch

1. Move the resistor from B7 to D5.
2. Place the switch with four pins on E5, F5, E7, and F7.
3. Attach your battery

** Be sure to remember POWER RAILS CONNECT VERTICALLY and THE MIDDLE SECTIONS (A-E or F-J) ARE CONNECTED HORIZONTALLY**