Explanation that temperature can cause Ohm's Law to break down. Includes a demonstration of Ohm's Law holding for one resistor and not for another.

Ohm's Law failing to hold for a light bulb with a resistance that varies with temperature.

Using a candle to increase the conductivity of air near an electroscope.

Using salt to increase the conductivity of water and light a bulb.

Calculation of resistance between body and Earth through a pair of shoes, including a demonstration that this resistance is not high enough to keep charge from flowing.

Connecting two batteries in series to demonstrate that the electromotive force doubles.

Finding the power supplied by a battery, with a demonstration of a 9V battery being shorted out.

Showing the large current and power supplied by a car battery when it is shorted out.

A power supply generated from falling water. Not explained until a later lecture.

Graphs of the voltage and current in an RC circuit with a square wave power supply.