Physics Quiz: Motors and Generators

What is the main function of an electric motor?

• Convert electrical energy into mechanical energy

• Generate heat energy

• Convert mechanical energy into electrical energy

• Produce light energy

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Explain the working principle of an electric motor.

• An electric motor works on the principle of electromagnetic induction.

• An electric motor works on the principle of photosynthesis.

• An electric motor works on the principle of nuclear fission.

• An electric motor works on the principle of gravitational force.

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What are the different types of electric motors?

• DC motors, AC motors, synchronous motors, asynchronous motors, and stepper motors

• Big motors, Small motors, Tiny motors, Large motors

• Fast motors, Slow motors, Medium motors, High motors

• Red motors, Blue motors, Green motors, Yellow motors

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NGSS.HS-PS3-3

How does the speed of an electric motor vary with the applied voltage?

• Directly proportional

• Inverse proportional

• Unrelated

• Constant

What is electromagnetic induction?

• The process of generating an electromotive force (emf) or voltage across a conductor in a changing magnetic field.

• The process of generating heat through friction

• The process of creating a magnetic field around a conductor

• The process of converting mechanical energy into electrical energy

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Describe Faraday's law of electromagnetic induction.

• The induced current is always in the opposite direction of the change in magnetic field

• A change in magnetic field through a circuit will induce an electromotive force (EMF) and therefore an electric current in the circuit.

• Faraday's law only applies to stationary magnetic fields

• A change in electric field through a circuit will induce an electromotive force (EMF)

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NGSS.HS-PS2-5

What is Lenz's law and how does it relate to electromagnetic induction?

• Lenz's law determines the speed of electromagnetic induction

• Lenz's law relates to electromagnetic induction by determining the direction of the induced current or emf in a circuit.

• Lenz's law only applies to mechanical induction

• Lenz's law has no relation to electromagnetic induction

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Explain the construction and working of a DC generator.

• A DC generator works on the principle of electromagnetic induction, where a coil of wire rotates within a magnetic field to produce a current.

• A DC generator works by using solar energy to produce electricity.

• A DC generator is powered by a battery and does not involve any electromagnetic induction.

• A DC generator operates by converting mechanical energy into heat energy.

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What is the role of the commutator in a DC generator?

• To regulate the voltage output

• To increase the speed of the generator

• To reverse the direction of the current in the coil

• To cool down the generator

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How does the output voltage of a DC generator change with the speed of rotation?

• Decreases

• Remains constant

• Fluctuates

• Increases