+Using Ohm’s

Law to Build a Voltage Divider

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+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).

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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

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+Getting Started

Divide into Teams

Review the materials

Challenge #1: Voltage Divider

Challenge #2: Light an LED

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+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

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+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

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+Reflections

What factors affected your design?

Measured vs Specified Battery Voltage

Measured vs Specified Resistance

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