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By Larry E. Schafer
Energize your subsequent unit on electrical energy with hands-on actions to provide an explanation for the attention-grabbing phenomenon of electromagnetism. scholars are brought to the standards that verify the power of electric coils, they usually use available fabrics to construct an easy motor and a generator. themes coated contain circuit breakers, mag-lev trains, and superconducting turbines.
Read or Download Charging Ahead: An Introduction to Electromagnetism (# PB155X) PDF
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Additional resources for Charging Ahead: An Introduction to Electromagnetism (# PB155X)
Sample text
Do not wrap the last 60 cm of wire. Twist the two 60-cm lengths of wire together to keep them from unraveling from the coil. Tape the nail to the bottom of a cup. Sand the enamel off the last 3 cm of each wire. When the electromagnet is used, you will have to tape the cup with the electromagnet securely to the tabletop so that the head of the nail is about 1 cm from a magnet on the rotor. To indicate where to place the permanent magnets on the rotor, draw a square with sides equal to the diameter of the cup.
The construction and operation of the motor. b Glue two cups together to make the rotor that will rotate on the F i g u re 3 . 0 cm Rotor support cup NATIONAL SCIENCE TEACHERS ASSOCIATION paper clips of the stands. Melt a small hole into the bottom of each of these rotor cups. Open up one loop of a large paper clip. Use pliers to hold the end of the paper clip in a flame. Use the hot end of the paper clip to melt a small hole in the bottom of each cup. The hole should be centered, small, and smooth so the rotor rotates freely and evenly.
You may want to challenge students to make changes that make their motors run faster (or slower). Place the magnet, with poles on the large faces, on the side of the battery. NATIONAL SCIENCE TEACHERS ASSOCIATION b c d Bend two large paper clips as F i g u re 3 . 17. Hold the paper clips to the battery with a rubBattery ber band or with masking tape. Wrap a meter of 24-gauge enamel-coated magnet wire around a toilet paper tube to create the coil. Make sure there is enough wire at the ends to wrap around the coil to hold the coil together and to extend out from the coil about 5 cm.