Generators, Motors & Induction

What is the primary function of an electric motor?

• To convert electrical energy into mechanical energy

• To convert mechanical energy into electrical energy

• To store electrical energy

• To generate alternating current

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According to Faraday’s Law of Induction, what happens when a magnetic field within a closed loop changes?

• The temperature of the loop increases

• An electric current is produced in the loop

• The magnetic field becomes static

• The loop expands

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What distinguishes an electromagnet from a permanent magnet?

• It can only attract ferromagnetic materials

• Its magnetic field can be turned on and off

• It is permanently magnetic

• It repels all types of metals

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How do generators convert mechanical energy into electrical energy?

• Through the use of batteries

• By converting thermal energy into electrical energy

• By moving a conductor through a magnetic field

• Through chemical reactions

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What is the principle of induction in the context of electricity and magnetism?

• The generation of heat in a conductor

• The creation of a magnetic field by an electric current

• The induction of a voltage when a magnetic field changes around a conductor

• The conversion of electrical energy into mechanical energy

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What are the two types of magnetic poles?

• Positive and negative

• North and south

• East and west

• Left and right

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What is a solenoid?

• A type of battery

• A coil of wire that produces a magnetic field when carrying an electric current

• A permanent magnet

• A device that converts mechanical energy into electrical energy

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What is the significance of the magnetic field in the operation of electric motors and generators?

• It provides a source of heat

• It induces an electric current in the conductor

• It reduces the friction in the motor

• It stores electrical energy for later use

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What is the role of the commutator in a DC electric motor?

• It converts AC to DC

• It allows the motor to run at variable speeds

• It reverses the direction of current in the coil periodically

• It stores electrical energy

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What is the effect of increasing the number of turns in the coil of an electromagnet?

• Decreases the strength of the magnetic field

• Increases the strength of the magnetic field

• Changes the direction of the magnetic field

• Has no effect on the magnetic field

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