1. Topic: Light Emitting Diodes Objective: ▫ Explain why LEDs only work with one setup and other bulbs are not as critical. Summary: Students use a battery and a red LED to determine the correct connections for this circuit. Students explain what happens based on both configurations and then a brief explanation is provided after the activity. Instructor Information

2. Topic: Light Emitting Diodes Methodology: ▫ Students experiment with the equipment to determine the solution. Explanation occurs after the trial and error troubleshooting. Differentiation: Students work in groups and students that have difficulty attaching the wires are given wires with banana clips instead of bare wires. Instructor Information

3. Light Emitting Diodes 3

4. LED Light

5. LED only work one way!! Electrons flow from Negative (-) to Positive (+) terminals BUT Current is the opposite direction because it is a positive flow of charges Current is positive flow and goes from Positive (+) to negative

7. LED Voltages LED ColorVoltage Drop Red1.8 Volts Green2.1 Volts Orange2.1 Volts Yellow2.1 Volts White3.5 Volts Blue3.6 Volts LED Currents Anywhere between 2 & 40 milliamps (mA)

8. Other Lighting Technology Incandescent Light Bulb Compact Fluorescent Light Bulb