Magnetism
Fill in the blanks:
_______________ attract
_______________ repel
Opposites attract
Like repel
What are the three charges an atom can have?
negative, positive or neutral (zero)
What is an electromagnet?
A magnet you can turn on and off
the battery
a specific place wires need to touch the components
Contact Points
What can you use to test if there is a magnetic field present?
another magnet, a compass, a magnetic material (iron nail)
What is an electric current?
the flow of electricity through connected wires
True or False:
Electricity flows through the plastic insulation on the wire.
False - plastic is the insulator to protect the copper and allows the wire to be touched
Electricity flowing in a closed loop
When energy is transferred from one system to another
Energy Transfer
a permanent magnet
What is the direction of an electric pathway?
From negative to positive
What are three ways to make an electromagnet stronger?
increase power/number of batteries, wind the wire more times, use a thicker wire
How do you know if there is electricity?
heat, light, magnetic field
part of the lightbulb that lights up
filament
Name 3 metals that are magnetic.
iron, cobalt, nickel,
Who invented the carbon filament for the first lightbulbs?
Lewis Latimer
True or False:
Electricity flows through the rivet in an electromagnet.
False - it flows through the wire, the wire wrapping creates the magnetic force
Which component opens and closes the circuit?
the switch
Material that electricity cannot flow through
Insulator
When a magnet causes a paperclip to move is an example of what type of energy?
potential energy
Who invented the battery?
Alessandro Volta
If you want to change something about your electromagnet, how many things do you change at a time?
1 variable at a time
Where does a wire need to connect to a lightbulb for it to light?
the metal tip and the metal cap
Material that electricity can flow through
Conductor