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Electric Motor MaterialsEnergy comes in many forms. Electric energy can be converted into useful work, or mechanical energy, by machines called electric motors. Electric motors work due to electromagnetic interactions: the interaction of current (the flow of electrons) and a magnetic field.

  • D battery
  • Insulated 22G wire
  • 2 large-eyed, long, metal sewing needles (the eyes must be large enough to fit the wire through)
  • Modeling clay
  • Electrical tape
  • Hobby knife
  • Small circular magnet
  • Thin marker
  1. Starting in the center of the wire, wrap the wire tightly and neatly around the marker 30 times.
  2. Slide the coil you made off of the marker.
  3. Wrap each loose end of the wire around the coil a few times to hold it together, then point the wires away from the loop, as shown:

Electric Motor ArmatureWhat is this? What is its purpose?

  1. 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. The exposed wire should be facing the same direction on both sides. Why do you think half of the wire needs to remain insulated?
  1. Thread each loose end of the wire coil through the large eye of a needle. Try to keep the coil as straight as possible without bending the wire ends.
  1. Lay the D battery sideways on a flat surface.
  2. Stick some modeling clay on either side of the battery so it does not roll away.
  3. Take 2 small balls of modeling clay and cover the sharp ends of the needle.
  4. Place the needles upright next to the terminals of each battery so that the side of each needle touches one terminal of the battery.
  1. Use electrical tape to secure the needles to the ends of the battery. Your coil should be hanging above the battery.
  2. ?Electric Motor Needles What happens when you spin the coil in the other direction? What would happen with a bigger magnet? A bigger battery? Thicker wire?

The motor will continue to spin when pushed in the right direction. The motor will not spin when the initial push is in the opposite direction.

The metal, needles, and wire created a closed loop circuit that can carry current. Current flows from the negative terminal of the battery, through the circuit, and to the positive terminal of the battery. Current in a closed loop also creates its own magnetic field, which you can determine by the “Right Hand Rule.” Making a “thumbs up” sign with your right hand, the thumb points in the direction of the current, and the curve of the fingers show which way the magnetic field is oriented.

In our case, current travels through the coil you created, which is called the armature of the motor. This current induces a magnetic field in the coil, which helps explain why the coil spins.

Electric Motor Removing Insulation Electric Motor with Clay

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