Review Magnetism – Attractive and Repulsive

How is the concept of magnetism and electricity different?1. Magnetism is caused by the

spinning of electrons2. Electricity is caused by the flow

of electrons

How are magnetism and electricity the same.Both have opposite polesBoth will affect the other

What do you call a hollow cylinder with wire wrapped around and how can it be changed?SolenoidIncrease or decrease the number

of wiresIncrease or decrease the power

to the coilsIncrease or decrease the size of

the shaft

Describe a motor and give the key concept that makes it work.Permanent magnetRotor with commutator and coilsPower SourceElectrical currents cause a magnetic

fieldLikes repelChanges electrical to mechanical

energy

Describe a generator and give the key concept that makes it works Permanent magnetRotorYou are the powerMechanical energy to electrical

energy

Motor Generator

What are the 2 types of current electricity?Direct Current

◦Source is a dry cell (battery)◦Electrons flow in one direction

Alternating Current (house)◦Generators – water, wind, solar◦Electrons reverse direction

What device is used to increase or decrease the amount of electricity flows into a house?TransformerHow does it work?

◦Wire coils around a magnetic core regulates the electricity flowing out the other side

◦Step Up and Step Down

Old StuffWhere are the strongest points of

a magnet?◦Poles

The areas around the poles are ______◦Domains

Give the direction of a magnetic field

North to south

Old StuffHow do you de-magnetize an

object?◦Heat it◦Bang it

What is electromagnetic induction?◦Electromagnetic induction is the

generation of a current by a changing magnetic field.

Rules of magnet◦Likes repel, opposites attracts