A bicolor LED connected to a circuit shows the difference between AC and DC power. With DC, the LED glows red or green depending on polarity, while with AC it alternates between colors at 60 Hz. Swinging the LED in a circle makes the rapid switching visible as a multicolored light ring.

1. Connect a bicolor LED to the base module so it can receive both AC and DC power.
2. Apply DC power in one direction and observe the LED glowing a steady green.
3. Reverse the DC polarity and observe the LED glowing a steady red.
4. Switch to AC power and note that the LED appears to glow steadily due to rapid color changes at 60 Hz.
5. In a darkened room, swing the LED cord in a circle and observe a multicolored ring of light showing the alternating colors.

📄 Two Color LED AC/DC Circuit - https://www.phys.ufl.edu/: https://www.phys.ufl.edu/demo/5_ElectricityMagnetism/L_ACCircuits/TwocolorLEDACcircuit.html

• Try different AC frequencies (if available) to see if the flicker becomes more or less noticeable.
• Use a high-speed camera to capture the alternating red and green flashes.
• Compare the effect with a single-color LED to highlight the bicolor difference.

• Handle all electrical equipment carefully and ensure wires are insulated.
• Use low-voltage AC and DC power sources to reduce risk of electric shock.
• Do not use near water or damp surfaces.
• Ensure the swinging LED has enough clearance to avoid hitting people or objects.

• Why does the LED show different colors depending on DC polarity? (Because each diode inside only allows current in one direction.)
• Why does AC power make the LED alternate between colors? (The current changes direction 60 times per second, switching between the two diodes.)
• Why can swinging the LED make the alternation visible to the human eye? (The motion spreads the light out into a path, making the rapid switching detectable as separate colors.)
• What might happen if the AC frequency were much lower? (The color switching would become visible without needing motion.)