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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.