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 provide an explanation for the attention-grabbing phenomenon of electromagnetism. scholars are brought to the criteria that make certain the energy of electric coils, and so they use available fabrics to construct an easy motor and a generator. subject matters coated contain circuit breakers, mag-lev trains, and superconducting turbines.

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Extra resources for Charging Ahead: An Introduction to Electromagnetism (# PB155X)

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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. Draw diagonal lines from corner to corner in the square. Place the cup upside down inside the square and mark the rim where the lines Making the Penny Switch cross the rim. The penny switch consists of Use silicon glue to glue the rim three pennies.

Small motors use a number of electromagnets rather than just one. In addition, real motors use a commutator and brushes, instead of floppers and penny switches, to turn the electromagnets on and off. The commutator rotates with the coils. The brushes remain stationary and conduct electricity from the power supply to the commutator. The commutator then conducts the electricity to just one of the coils at a time. The commutator is insulated so electricity is not conducted from coil to coil. 8, notice that coil A is receiving electricity from the brushes through the commutator.

In this activity, you will build an electric motor out of common materials, including plastic drinking cups, wire, batteries, plastic drinking straws, and magnets. Although the motor you build will not be able to accomplish much, it should provide you with a basic understanding of how real electric motors work. ” Furthermore, as you persist in getting your motor to work, you may understand better the persistence and problem solving required to create a useful product that works reliably. Your teacher will either provide you with the rotor, flopper switch, and penny switch for this activity or guide you through constructing them.

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