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Electricity and Magnetism

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5D 10.10 - Voltage Divider
Demonstrates: Potential affected by a resistor.
Description: Description: A rheostat is used as a voltage divider to show how to produce any voltage up to the maximum of the source.
5D 10.30 - Rheostats
Demonstrates: Resistance.
Description: Voltage and current are varied as slider is moved.
5D 20.10 - Resistance as a Function of Temperature
Demonstrates: Resistance.
Description: A small bulb is attached to powersupply by a coil of copper wire. After coil of wire is placed in liquid nitrogen the bulb becomes brighter due to decreased resistance. Put coil in boiling water to increase resistance.
5D 40.10 - Jacob's Ladder
Demonstrates: High voltage phenomenon.
Description: High voltage from a transformer is applied to electrodes. The narrow spacing at the bottom promotes electrical breakdown of the air. The conducting path of the discharge heats up and rises.