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+ 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). 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 + 4 Getting Started Divide into Teams - Engineers work with Teachers Review the materials Challenge #1: Voltage Divider Challenge #2: Light an LED + 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 + 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 + 7 Reflections What factors affected your design Measured vs Specified Battery Voltage Measured vs Specified Resistance Teaching the Math Concepts Solving Simultaneous Equations Trial and Error Modifications to the lesson for your grade Incorporating the lesson into our classroom level