## Resources

Resistor color codes graphic (PNG) – Learn how to decode the color codes on a 4-band resistor using this chart.

Voltage, current, resistance, and Ohm’s law – This tutorial page from SparkFun contains a lot of information about Ohm’s law and the properties of voltage, current, and resistance.

## Parallel and Series Circuits

I recorded this video for the So That Explains It series at COD. It helps to explain why all of the lights go off in a strand of holiday lights when only one bulb goes bad, using the concepts of series and parallel circuits.

## PhET Ohm’s Law Simulation

See how voltage, resistance, and current are related to each other using the equation *V = IR*.

## PhET Circuit Construction Simulation

Build a circuit using household objects or electronic parts.