Motors and Generators

What is an electric motor?

• A device that converts heat energy into mechanical energy

• A device that converts light energy into electrical energy

• A device that converts mechanical energy into electrical energy

• A device that converts electrical energy into mechanical energy

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How does an electric motor work?

• By using the principles of sound waves

• By using the principles of chemical reactions

• By using the principles of magnetism and electricity

• By using the principles of gravity

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How does increasing the current affect the speed of rotation of an electric motor?

• It increases the speed of rotation

• It has no effect on the speed of rotation

• It decreases the speed of rotation

• It reverses the direction of rotation

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What do step-up transformers do to a circuits voltage?

• Increase it

• Decrease it

• No affect on voltage

• Drop it to 0

Choose all of the generators

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Choose all of the motors.

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Generators are devices that convert _____ energy into _____ energy.

• chemical; mechanical
• mechanical; electrical
• electrical; mechanical
• potential; kinetic

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Motors are devices that convert _____ energy into _____ energy.

• chemical; mechanical

• mechanical; electrical

• electrical; mechanical

• potential; kinetic

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NGSS.HS-PS3-3

NGSS.HS-PS3-5

A transformer actually transforms

• voltage

• magnetic field lines

• generators into motors

What are the two main types of transformers?

• Left transformers and right transformers

• Big transformers and small transformers

• Step-up transformers and step-down transformers

• Up transformers and down transformers