EM Induction 2

A generator is used to light a bulb.  Energy for lighting the bulb actually comes from a

• coil or wire
• mechanical intput to the generator
• magnet in the generator
• plug where the generator is connected to the wall

A device that converts mechanical energy into electrical energy

• A. electric generator
• B. electric motor
• C. electromagnetic induction
• D. mechanical  generator

The process of creating a current in a circuit by changing a magnetic field

• A. electric generator
• B. electric motor
• C. electromagnetic induction
• D. magnet

What is created when a magnet moves through a coil of wire?

• A. an electromagnet
• B. a ferromagnet
• C. a solenoid
• D. an electric current

Who discovered electromagnetic induction?

• Hans Christian Orsted
• Michael Faraday
• James Maxwell
• Heinrich Hertz

As the north pole of the magnet is moved into the coil, the magnetic flux is _________.

• increasing

• decreasing

• remains constant

• depends on the speed of the magnet

When you thrust a bar magnet to and fro into a coil of wire, you induce

• alternating current

• direct current

• both of the above

A transformer consists of

• Metal Core

• Metal core and coiled wire

• Metal core and polymer wire

• Polymer core and metal wire

Transformer is device that

• converts AC voltage to current

• converts electrical energy to kinetic energy

• converts AC voltage to a different level at the same amplitude

• converts AC voltage to a different level at the same frequency

Select the facts about transformer.

• Will not work with DC and AC

• Will not work with DC

• AC will produce change in magnetic field

• AC will induce current