If this is your first experience with electrical circuits, it is important to remember that electrical current always needs a complete path in which to flow; in this case, from the positive to the negative terminal of the battery. Attach the curved side of the battery firmly to a table or other flat surface using the clay or sticky tack. Record your predictions in your lab notebook. These forces push the electromagnet, which freely spins on its axle, and an electric motor is born. This flow of electrons through wire is electric current, and it produces a magnetic force.
The success rate with this design has been quite good. How to calculate the rate of motor spin using a voltage probe is described in. You should be able to see the bare copper wire. You may find that changing position of the reed switch or other sensor can change the direction of rotation. You can actually predict in which direction the coil will be pushed or in which direction the motor will spin with Fleming's left-hand rule for motors.
It will be used to record your findings. Unfold the paperclip so it can span the distance between the 2 axle supports. A: The answer you received empirically by experimenting is your data. In fact, you can walk through your house and find many electric motors hidden in electrical devices, appliances, and toys in every room. When you touch the wire to the side of the magnet, you complete an electric circuit.
A permanent magnet further explained below is represented in this diagram. Hold your left hand out, as shown in Figure 2 below, with the thumb, pointer, and middle fingers at right angles to each other and imagine arrows at the end of these three fingers. Remember that stripping the insulation allows electrical contact so electrical current will flow. This is because the friction force is proportional to the normal force. This motor can also be used to demonstrate how a generator works.
A motor requires continuous motion. It is an excellent demonstration model of how an electric motor works. Just about any copper wire will work fine for this application. When the loop of wire is in a vertical plane, the forces on the top and bottom wires of the loop will be in opposite directions. How did the motor react to stronger permanent magnetic fields? Remove the permanent magnets, bring the compass close to your coil, and see if the compass needle moves. Over the side of the table, have one person hold the grouped magnets next to the bottom of the loop of wire.
Knowing how a current-carrying wire moves, what would happen if the wire was bent into a loop? You can also bend two paper clips one for each side to make a holder. Be sure that you are still looking at the positive side of the battery. Neither you, nor the coeditors you shared it with will be able to recover it again. This is when things get interesting! When using batteries of higher voltage, and bare wires, be very careful. Electric motors work due to electromagnetic interactions: the interaction of current the flow of electrons and a magnetic field. In this motor, the sliding electrical contact between the ends of the coil of wire and the paper clips turns off the current for half of each cycle. Make sure the foil makes a good contact with the clip.
Give the coil a spin to start it turning. My data proved my hypothesis correct because I clearly stated that the Duracell battery would be the most effective and my data proved the Duracell battery lasted long when powering my simple electric motor. The magnetic field of the disk magnets exerts a force on the electric current flowing in the wire. The real champion is the homopolar motor. Once you have the pencils taped or find a suitable cylinder, begin wrapping your wire around it tightly.
When the loop of wire is in a vertical plane, the forces on the top and bottom wires of the loop will be in opposite directions. Figure 19, below, indicates the electrical connections in your motor. Technical Note Why do we strip the wire this way? Magnets have two poles, north and south. Adding up all those pushes, or motions, creates the nice spinning movement of a motor. This, of course, is the principle of the electric generator. Contact of the bare wire with the axle support will create an electrical connection and allow current to flow. All that pushing and pulling will create some serious spinning and that is exactly what a motor is, a spinning axle.
Just as a potter forms clay, or a steel worker molds molten steel, electrical and electronics engineers gather and shape electricity and use it to make products that transmit power or transmit information. Spin the coil and see if any current registers on the meter. If you strip too much, forces in opposite directions will cause the motor to fail. Step-by-step illustration of how to bend a paperclip shown on the left to create the axle support on the right. In summary, like poles north-north or south-south repel, opposite poles north-south attract. The speed control unit is available in our store.
Suppose that the permanent magnets are mounted with their north poles facing upward. As opposite poles attract, the north pole of the needle will be attracted to the south pole of the magnet. Note : Only the end of the axle needs coating to be removed. So you use sandpaper to rub it off. Faraday created a simple motor to illustrate this phenomenon. The temporary magnetic field will interact with the permanent magnetic field and give the wire a push.