Electric Charges
What charge do electrons have? What charge do protons have?
Negative, Positive
Where is the magnetic force field the strongest on the magnet?
At the poles
Why does static electricity occur?
It is the build up and transfer of charged electrons
What are the parts of an electromagnet
Ferromagnetic core (iron, nickel, cobalt, steel, etc), wire (conductor), battery (voltage source)
The flow of charged particles through a circuit
A. static electricity
B. current electricity
C. electric resistance
B. Current Electricity
If an object loses electrons what is the charge?
positive
In which direction are magnetic field lines always drawn?
North to South
What type of field is produced around an electric current
electric and magnetic fields
If you increase the current in the electromagnet what will happen?
It will have more magnetism and electricity. It will be a stronger electromagnet
The amount of energy the source uses to move one coulomb of electrons through the circuit
A. Battery
B. Electricity
C. Voltage
C. Voltage
If an object gains electrons what is the net charge?
Negative
Timmy broke a bar magnet in half. Explain what happens to the magnetism in the two new pieces of the magnet.
Each piece will now have a new north and South Pole. They will be two separate magnets.
Give an example of an insulator and a conductor
Answers may vary
If the current of an electromagnet stops what will happen to the magnetism?
There will be no magnetism
A material in which electrons cannot easily move.
A. Conductor
B. Insulator
C. Electric Resistance
B. Insulator
What occurs when a positive and negative charge are close together?
They attract
Give an example of a ferromagnetic object
Steel, iron, coal, aluminum, etc
Does an object have to touch in order to feel the electric field?
No
Give an example of an electromagnet
Answers will vary (headphones, speakers, motors, generators, junkyard magnets, etc.)
Net gain or loss of electrons
A. Electric Charge
B. Electric Current
C. Static Electricity
A. Electric Charge
If an atom has 7 protons, 7 neutrons, and 8 electrons. What is the charge? and why?
negative, It has more electrons than protons
What happens to the magnetic force as you move the poles together
The force gets stronger
An electric charge is negative if the field lines move towards the charge
True or False
True
Give two ways to increase the strength of the electromagnet
1. Increase the voltage, 2. increase the size of the wire to decrease resistance 3. Use more coils 4. Use a better ferromagnetic core
What is the difference between static electricity and current electricity?
Static electricity: The charged particles are sitting still on a surface waiting to be transferred
Current electricity: These charged particles are in motion around a circuit due to voltage.