Here’s a step-by-step guide on how to connect 3 LEDs in series with a 9V battery, switch, and resistor.
Materials Required:
- 3 × LEDs (3V, 20mA standard)
- 1 × Resistor (330Ω or calculated value)
- 1 × 9V Battery
- 1 × SPST Switch
- Wires or Breadboard
Why Connect LEDs in Series?
- In a series connection, the voltage divides across each LED, meaning they share the 9V supply from the battery.
- In series, you only need one resistor for the entire circuit, rather than one for each LED.
Video Step-by-Step Instructions:
1. Connect the Switch:
- Connect the positive terminal (+ve) of the 9V battery to one terminal of the SPST switch.
2. Series Connection of LEDs:
- Connect the anode (+ long leg) of the first LED to the other terminal of the switch.
- Connect the cathode (– short leg) of the first LED to the anode (+ long leg) of the second LED.
- Connect the cathode (– short leg) of the second LED to the anode (+ long leg) of the third LED.
3. Add the Resistor:
- Connect a resistor (22Ω) to the cathode (– short leg) of the third LED.
- The other end of the resistor will be connected to the negative terminal (–ve) of the 9V battery.