Review Magnetism – Attractive and Repulsive

How is the concept of magnetism and electricity different? 1. Magnetism is caused by the spinning of electrons 2. Electricity is caused by the flow of electrons

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

What do you call a hollow cylinder with wire wrapped around and how can it be changed ? Solenoid Increase or decrease the number of wires Increase or decrease the power to the coils Increase or decrease the size of the shaft

Describe a motor and give the key concept that makes it work. Permanent magnet Rotor with commutator and coils Power Source Electrical currents cause a magnetic field Likes repel Changes electrical to mechanical energy

Describe a generator and give the key concept that makes it works Permanent magnet Rotor You are the power Mechanical energy to electrical energy

MotorGenerator

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? Transformer How does it work? ◦ Wire coils around a magnetic core regulates the electricity flowing out the other side ◦ Step Up and Step Down

Old Stuff Where 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 Stuff How 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