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The hypothesis that  friction loss in a DC motor  increases as the power and size of the motor  are increased, is proven to be true.

Electric motors are used to convert electrical power into mechanical power. They are normally used in fans, pumps, blowers, tools, electrical appliances and hard dick drives. Some very tiny motors are also found in wrist watches. Larger motors are used in ship and aircraft propulsion systems

Also consider

Try to repeat the experiment to compare the efficiency of motors.

The experiment can also be repeated using AC motors.


Electric motor -

Motor losses -

DC motor theory -

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Complexity level:
Project cost ($):
Time required:
1 hour to prepare, 1 day for the science project experiment
Material availability:
Motors will have to be purchased from an appropriate hobby store
Safety concerns:

Handle all electrical devices and motors with care to prevent electric shock/injury from moving parts. The assistance and supervision of a suitably qualified adult is required.