Magnetism
What would happen if the north ends of two magnets were close together?
repel
Socks taken from a clothes dryer that stick together or a lightning bolt in the sky are examples of ____________.
static electricity
Is a circuit open or closed if you haven't turned on the switch?
open
What is a material that lets electric current pass through?
conductor
True or False: An electromagnet is a permanent magnet.
False An electromagnet can be turned on or off. Once the circuit is broken, the magnetism is lost.
If a south end of a magnet is close to a north end of a magnet, the magnets will _________.
attract
True or False: Like charges attract and unlike charges repel.
False Like charges repel and unlike charges attract.
What supplies current to an electrical circuit?
battery (or other electrical source)
What is a material that blocks an electric current from passing through?
insulator
True or False: An electric crane is an example of an electromagnet.
True
True or False: All magnets have the same shape and size.
False
If you rub your hair on a balloon and the balloon becomes negatively charged, what charge will your hair have?
positive charge
What part of a circuit does electrical energy change from one form to another?
a load (lightbulb) This is where the energy changes to produce heat or light.
Which of these materials is not a conductor: copper, aluminum, gold, or wood?
wood
True or False: A refrigerator magnet is a permanent magnet.
True Even when you take it off the refrigerator, it is still magnetic.
True or False: All magnets have a north and south pole.
True
Current electricity that is produced by passing magnets past coils of wire, including wind and water turbines.
human-harnessed electricity
Which of these materials is a conductor: rubber, glass, air, silver?
silver
An electromagnet must be part of an electrical ______.
circuit
Will a magnet attract copper, rubber, iron, or plastic?
iron
Naturally-occurring electricity that occurs when there is a buildup of negative charges in one place.
static electricity
An electrical circuit is made up of a connector (wire), a load (lightbulb), a switch, and a ____________.
battery (or electrical source)
True or False: Pure water is a conductor.
False The salts and other materials in water are conductors though. So, don't mix water with an electrical circuit!!!!
An electromagnet is made up of what three items?
iron bar (nail), battery, and a wire