1. + Using Ohm’s Law to Build a Voltage Divider 1

2. + Learning Objectives Understand and demonstrate the engineering design process Use Ohm's Law as a tool for engineering design. Use a digital multimeter to collect data. Analyze the electrical requirements of light emitting diodes (LED’s). 2

3. A Voltage Divider A voltage is applied to two resistors in series The same amount of current flows through each resistor Voltage is divided between R1 and R2 Ohm’s Law 3

4. + Getting Started Divide into Teams Review the materials Challenge #1: Voltage Divider Challenge #2: Light an LED 4

5. + Challenge #1 Learning to read resistor values Using a breadboard to build an example voltage divider Build a voltage divider to meet a design requirement 5

6. + Challenge #2 Design your circuit - What voltage and current are required by the LED? Build your circuit - What is the polarity of your LED? Test your design. Did you get the desired voltage and current? What is the voltage across the LED Try a different design goal 6

7. + Reflections What factors affected your design? Measured vs Specified Battery Voltage Measured vs Specified Resistance 7