Electromagnetism Quiz: Physics 8th Grade

Who discovered the principle of electromagnetic induction?

• Hans Christian Ørsted

• Michael Faraday

• Nikola Tesla

• Thomas Edison

What does electromagnetic induction in Faraday's experiment explain?

• How a magnetic field can be induced by electricity

• How an electric current is induced by moving a conductor through a magnetic field

• The relationship between electricity and magnetism

• How to generate electricity using wind

Which device converts mechanical energy into electrical energy through electromagnetic induction?

• Electric Motor

• Generator

• Transformer

• Electric Battery

In which device does the rotor rotate to generate alternating current (AC)?

• DC Generator

• Alternator

• Electric Motor

• Transformer

What is the main difference between a DC generator and an AC generator?

• DC generators generate AC, while AC generators generate DC

• DC generators use a commutator to rectify current

• DC generators generate alternating current

• AC generators cannot produce electrical energy

Which principle is the foundation of how electric motors work?

• Electromagnetic induction

• The interaction of magnetic fields

• Chemical reaction

• Electrical resistance

How does an electric motor generate motion?

• By creating an electric current

• By using a moving conductor in a magnetic field

• By converting electrical energy into mechanical energy

• By rectifying alternating current

What type of current is generated by an alternator?

• Direct Current (DC)

• Alternating Current (AC)

• Pulsating Current

• Static Current

Which of the following devices uses a commutator to rectify alternating current?

• Electric Motor

• Alternator

• DC Generator

• Transformer

What is the purpose of a transformer?

• To convert mechanical energy into electrical energy

• To change the voltage of alternating current

• To generate alternating current

• To store electrical energy