Charging Ahead: An Introduction to Electromagnetism (# by Larry E. Schafer

By Larry E. Schafer

Energize your subsequent unit on electrical energy with hands-on actions to give an explanation for the attention-grabbing phenomenon of electromagnetism. scholars are brought to the criteria that make certain the power of electric coils, they usually use available fabrics to construct an easy motor and a generator. issues lined comprise circuit breakers, mag-lev trains, and superconducting turbines.

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Each passing rotor magnet the penny switch pushes the flopper down and turns CHARGING AHEAD: AN INTRODUCTION TO ELECTROMAGNETISM 43 on the electromagnet. When a rotor magnet moves past the flopper magnet, the flopper magnet moves upward and opens the switch at the other end. When you remove the washer from the flopper, the motor often runs relatively fast. In this case, the flopper is just rapidly jiggling up and down and is not flopping. The on-off switching, however, is somehow still synchronized with the rotor rotation, but how?

10). Trim off any excess tape. 11). 5 cm of space between the two small rectangles. Cut a short slit in the middle of one long side of the base. d Sand the enamel from the ends of two 60-cm lengths of #24 magnet wire. Make sure there is no enamel left on the last 3 cm of wire. 12. 5 cm apart. Press the masking tape tightly to the wires and pennies to ensure solid contact between the wires and pennies. F i g u re 3 . 0 cm Slit Side view Tablet-back cardboard 40 NATIONAL SCIENCE TEACHERS ASSOCIATION Corrugated cardboard Insert the middle penny beneath the two side pennies.

5. Create a circuit so that the light bulb blinks on and off as the rotor is turned. Do not remove the wires from the penny switch. Try not to move the flopper. Use the adjuster straw to raise and lower the middle penny of the penny switch. 5 to show how you connected the various parts to create the “strobe” light. 6WhatWhen the rotor magnet is directly over the flopper magnet, what does the flopper magnet do? does the switch end of the flopper do? Write your answers here. 30 NATIONAL SCIENCE TEACHERS ASSOCIATION F i g u re 3 .

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