Electromagnetic Induction and Alternating Currents Quiz

What is electromagnetic induction?

• The process of producing an electromotive force (Emf) by varying the magnetic field surrounding a conductor.

• The process of producing an electric current by passing a wire through a magnetic field.

• The process of producing a magnetic field by passing an electric current through a wire.

• The process of producing an electric current by rotating a coil between two magnetic poles.

Who discovered electromagnetic induction independently?

• Joseph Henry

• Michael Faraday

• Both Joseph Henry and Michael Faraday

• None of the above

Which factor increases the strength of electron flow in a generator?

• A greater number of turns (loops) of wire in the coil.

• A slower speed of the conducting loop rotation.

• A decreased strength of the magnets.

• Positioning the moving coil parallel to the magnetic field lines of force.

What is the difference between Alternating Current (AC) and Direct Current (DC)?

• AC flows in one direction, while DC periodically reverses direction.

• AC periodically reverses direction, while DC flows in one direction.

• AC and DC both flow in one direction.

• AC and DC both periodically reverse direction.

How can you determine the direction of wire movement in a generator using the left-hand rule?

• Point your thumb, forefinger, and middle finger of your left hand in the direction of the wire movement.

• Point your thumb, forefinger, and middle finger of your left hand in the direction of the magnetic field.

• Point your thumb, forefinger, and middle finger of your left hand in the direction of the induced electron flow.

• Point your thumb, forefinger, and middle finger of your left hand in the direction of the North pole of the magnets.

What is the term for a device that can increase or decrease the voltage of an alternating current?

• Generator

• Transformer

• Inductor

• Rectifier

What type of current always flows in one direction?

• Alternating Current (AC)

• Direct Current (DC)

• Both AC and DC

• None of the above