Motors and Generators Exit Slip

What device is made of coils of wire with an electrical current passing through it in order to generate a magnetic field?  

• Electromagnet

• Electron magnet

• Generator

• Motor

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Which of the following will produce the strongest electromagnet?

• A coil of 20 turns of wire

• A coil of 20 turns of wire

• A coil of 30 turns of wire

• A coil of 40 turns of wire

The brushes in an electric motor

• the split rings that rotate in a motor

• the coil that create the electromagnetic field

• Are spring loaded connectors that carry electricity to the rotor by brushing against the commutator as it rotates

• the magnets surrounding the rotor

Which of the following principles explains how an electric motor works?

• Magnetic force

• Magnetism

• Electrolysis

• Electromagnetism

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What do you call a device that converts mechanical movement into electricity?

• electric field

• electric motor

• electric generator

• electric plasma

The rotating part of an electrical motor.

• brushes

• magnet

• commutator

• armature

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A device that controls the direction of the flow of current through an electric motor (shown here in light grey)

• the armature

• the brushes

• the magnets

• the commutator rings

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Which of the following illustrations show the working principle of an electric motor?

• 
• 
• 
• 

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What is the correct sequence on the working principle of an electric motor?

• I, II, III, IV

• II, IV, I, III

• III, I, IV, II

• IV, II, III, I

The diagram shows a simple DC electric motor which is rotating.

Which change will make the motor rotate more quickly?

• reversing the polarity of the magnets

• reversing the battery

• removing the magnets

• using more powerful magnets

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