Summarize:

Make several turns around the cardboard box with enamel coated copper wire (#30 magnet wire). Wind 200 feet (61m) of wire as tight as you can. Leave about 16 to 18 inches (40.6 to 45.7cm) of wire loose on each end to connect to your meter, light bulb, or other electronic device. The more "turns" or winds you make around the cardboard frame, the more power your generator should produce. Use a knife or a wire stripper to remove the insulation from each end of the wire. Remove about 2.54 centimetres (1.00in) of insulation from each side. This will allow you to connect the wire to an electronic device. Attach the two wires you have loose at the ends of the windings to a red LED, #49 miniature bulb, or a 1.5V grain-of-wheat lamp. Or, connect the test leads from an AC voltmeter or multimeter to them. Keep in mind that you are producing a very low voltage, and larger devices (e.g. a regular light bulb) will not be powered by this generator.
Wind the copper wire. Strip the ends of the wire. Connect the wires to an electronic device.