Physics Lesson 16.3.5 - Electric Motor

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Welcome to our Physics lesson on Electric Motor, this is the fifth lesson of our suite of physics lessons covering the topic of Magnetic Force on a Current Carrying Wire. Ampere's Force, you can find links to the other lessons within this tutorial and access additional physics learning resources below this lesson.

Electric Motor

Electric motor uses the interaction between electric current and magnetic field to produce motion. The example with the current carrying coil placed between two magnets discussed earlier represents the main mechanism of an electric motor. Basically, an electric circuit supplies the coil with electricity, while the magnetic field is provided by the two magnets between which the coil is placed. As a result, a movement in the form of torque (as seen in the examples of the previous paragraph) is produced.

There is a drawback to overcome in this mechanism however. The electric circuit which supplies the coil, cannot rotate together with the coil as it rotates very fast. The circuit must remain stationary while the coil rotates. This is made possible by using a commutator (the cylindrical part shown in the figure in theory)

The output of electric motor is mechanical energy. Thus, we can say: "an electric motor is a device that converts electricity into mechanical energy."

Many electric appliances such as washing machines, vacuum cleaners, fans, air conditioners, refrigerators, etc., make use of electric motors to operate. In addition, there exist many other industrial appliances which use electric motors among which there are pumps, compressors, crushers, HVAC systems, etc.

You have reached the end of Physics lesson 16.3.5 Electric Motor. There are 5 lessons in this physics tutorial covering Magnetic Force on a Current Carrying Wire. Ampere's Force, you can access all the lessons from this tutorial below.

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6. Continuing learning magnetism - read our next physics tutorial: Magnetic Force on a Wire Moving Inside a Magnetic Field. Lorentz Force

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