Electromagnetic induction

What does EMF stand for?

• Electromagnetic Frequency

• Electromagnetic Field

• Electromotive Force

• Electronic Music Foundation

Who discovered electromagnetic induction?

• Nikola Tesla

• Albert Einstein

• Michael Faraday

• Isaac Newton

What is necessary to induce a voltage in a wire?

• The wire must cut through magnetic field lines

• The wire must move along the magnetic field lines

• The wire must be stationary

• The wire must be insulated

What happens when a wire cuts through magnetic field lines?

• It breaks

• It becomes magnetic

• It generates heat

• A voltage is induced

How can you increase the EMF induced in a wire?

• By using more coils of wire

• By painting the wire

• By using a longer wire

• By using a thinner wire

What are the three things needed to generate electricity according to the video?

• A magnet, a coil of wire, and sunlight

• A battery, a coil of wire, and movement

• A magnet, a coil of wire, and movement

• A magnet, a battery, and movement

What did Michael Faraday say about induced EMF?

• It is inversely proportional to the rate of change of magnetic flux

• It decreases with the increase of magnetic flux

• It is proportional to the rate of change of magnetic flux

• It is constant regardless of the magnetic flux

What is the main method used for generating electricity?

• Electrostatic Induction

• Electromagnetic Induction

• Thermal Induction

• Chemical Induction

What effect does moving a magnet near a coil of wire have?

• It increases the wire's resistance

• It reduces the wire's temperature

• It induces an electromotive force

• It demagnetizes the magnet

What did the experiment with the LED demonstrate?

• The LED can light up without any power source

• LEDs can generate their own electromagnetic fields

• Magnetic fields can generate light directly

• Spinning magnets near a coil can induce current to light an LED