Using simple materials such as cells, wires, globes and magnets you can make models of these devices. You will have to use your knowledge of electricity to invent your circuit so that you can make the lights flash. The nerve tester sliding contact device is similar to the overhead sliding contact of the train.
To reduce the effect of the friction of the brushes mount the two pins close to the axle shaft.
You could make a model of your front door so that when you push a button a buzzer or bell rings, or when you open the door the porch light comes on. Students may have to invent their own way of connecting the cells if holders are not available. The important design features of this second electric motor are that the coil must be well balanced and the pins (for the commutator) close to the axle shaft. Starting in the center of the wire, wrap the wire tightly and neatly around the marker 30 times. Ask an adult to use the hobby knife to help you remove the top-half of the wire insulation on each free end of the coil. Place the needles upright next to the terminals of each battery so that the side of each needle touches one terminal of the battery.


Tape the small magnet to the side of the battery so that it is centered underneath the coil. In our case, current travels through the coil you created, which is called the armature of the motor. Neither the service provider nor the domain owner maintain any relationship with the advertisers. Can you move the sliding contact from one end of the overhead wire to the other without touching it? You may need to fiddle to get it to work, but when it works, the coil twirls around at a rapid rate. All the models work, but some may require a lot of tinkering to get them to work efficiently. This motor will run with one cell, one pair of magnets and only 10 turns of wire, if it is well constructed.
Electric energy can be converted into useful work, or mechanical energy, by machines called electric motors. Current flows from the negative terminal of the battery, through the circuit, and to the positive terminal of the battery. North-south interactions stick together, and north-north and south-south interactions repel each other.


We need a way to periodically break the circuit so that it pulses on and off in time with the rotation of the coil. The reason that the magnet only spins in one direction is because spinning in the wrong direction will not cause the magnetic fields to repel each other, but attract. In case of trademark issues please contact the domain owner directly (contact information can be found in whois).
The electric motors are more difficult to construct than the electric horn or the skill tester. The wire touching the top of the metal strip needs to be stiff and firm so it does not vibrate. Because the magnetic field created by the current in the wire is not perpendicular to the magnet taped to the battery, at least some part of the wire’s magnetic field will repel and cause the coil to continue to spin. The way we set up our engine makes it so that whenever current is moving through the coil (giving it a magnetic field), the coil is in a good position to be repelled by the stationary magnet’s magnetic field.




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