Electricity Chapter 13

Do modern homes use electricity arranged in series or

parallel?

• series

• parallel

What happens if a magnet is brokne in half?

• Nothing

• each new magnet will not be magnitized

• The north seeking pole of one part will attract the south seeking pole and repel the north seeking pole of the other part

• One half of the magnet will only be north and the other half will all be south

What is produced when a coiled wire is spun around a magnet?

• electrical energy

• magnetic energy

• mechanical energy

• thermal energy

What did Michael Faraday do when he discovered that changing a magnetic field created an electric current in a wire?

• He told no one of his investigation.

• He did not think he had discovered anything.

• He shared his investigation with other scientists.

• He told only Joseph Henry about this investigation

How can the strength of an electromagnet be increased?

• by using less current

• by using a smaller magnet

• by using a smaller magnetic core

• by using more turns in the metal coil

In a doorbell, electromagnets help convert _____________to

_________to ________________>

• magnetic energy, electric energy, mechanical energy

• electric energy, magnetic energy, mechanical energy

• electric energy, mechanical energy, magnetic energy

• mechanical energy, magnetic energy, electric energy

Why does a compass needle point in a north-south direction?

• The needle reacts to the Earth's magnetic poles.

• The needle forms an electromagnet with Earth's poles.

• The needle is lightweight, so it always spins to the south.

• The needle is pulled in the middle by Earth's equator.

What would happen to the other light bulbs in the circuit if one of the light bulbs burns out?

• The other light bulbs will remain on.

• The other light bulbs will brighter.

• The other light buls will dimmer.

• The other light bulbs will go out

A material that conducts electric current poorly is called

• a circuit

• a charge

• a conductor

• an insulator

Where is a magnetic field the strongest?

• at the poles

• in the middle

• at the south seeking pole

• at the north seeking pole