Experiments with Electricity and Magnetism by Robert Gardner

Author:Robert Gardner
Language: eng
Format: epub
Publisher: Enslow Publishing, LLC

•Can other fruits and vegetables, such as oranges, apples, olives, pickles, and potatoes, be used as electric cells? If so, which ones generate the largest electric currents?

3.7Light-Emitting Diodes

THINGS YOU WILL NEED:

•2.1-volt light-emitting diode (LED), purchased at an electronics store

•two D-cells

•wide rubber band

•insulated wires with clips

A diode is an electronic device that allows electric current to flow in only one direction.

1.Examine a light-emitting diode (LED). Notice that one wire lead is a bit longer than the other.

2.Place two D-cells in series. Hold them together with a wide rubber band.

3.Use an insulated wire to connect the short lead of the diode to the negative pole of the battery. Touch the long lead to the positive pole of the battery. What happens?

4.Reverse the leads. Connect the diode’s short lead to the battery’s positive pole. Touch the long lead to the negative pole of the battery. What happens this time?

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