Magnetism
Electricity
Circuits
Conductors and Insulators
Motors and generators
Random facts
100
The north pole of one magnet attracts ________.
the south pole of another magnet
100
Give an example of static electricity occurring.
Lightning striking, socks sticking together in the dryer, a balloon attracting your hair after rubbing both together, etc.
100
In order for electricity to flow through a circuit, should it be "open" or "closed"?
A closed circuit (closing a switch) will allow electricity to flow. Opening the switch turns off the flow.
100
Plastic, rubber, and wood make good __________.
Insulators
100
Compare 2 electromagnets that are identical except "A" has more coils than "B". Which electromagnet could pick up more paper clips?
A could pick up more than B due to more coils increasing the magnetic field strength.
100
Name a type of temporary magnet that only works when current flows through wire.
electromagnet
200
Where is the greatest force of a magnetic field around a magnet?
at the poles of the magnet
200
Why can electrons be easily stripped off of atoms?
The electrons are located outside of the atom's nucleus. The protons and neutrons remain in the nucleus and don't leave very easily.
200
What type of circuit is shown here?
This is a SERIES circuit.
200
We are advised to not use electrical devices around water. Why?
Most water has dissolved substances in it that will conduct electricity.
200
What device changes mechanical energy (movement) into electrical energy?
generator
200
How can large junkyards separate iron and aluminum objects easily?
use a magnet; it will not be attracted to aluminum
300
What property around a bar magnet can be revealed by sprinkling iron filings around a magnet?
We can see the manet's magnetic field.
300
What type of energy is converted in a battery?
Chemical energy is converted into electric energy
300
What type of circuit is shown here?
This is a PARALLEL circuit.
300
A circuit is made with a bulb, a battery, and pencil lead (graphite) instead of wires. What property of graphite allows electricity to flow through it?
good conductor of electricity
300
In order to make an electromagnet, what is needed besides an iron core and a coil of wire?
A battery or other source of electricity is needed.
300
When do atoms have neither a positive nor negative electric charge?
When the number of protons is equal to the number of electrons in the atom.
400
What will happen to a compass placed next to a current-carrying wire?
The compass needle will move because a current-carrying wire creates a magnetic field.
400
What type of electricity happens when clothes in a dryer become stuck together?
Static electricity
400
If you have several lightbulbs on a parallel circuit, what happens when one bulb is burned out?
The rest of the bulbs will remain working in a parallel circuit.
400
Name 2 materials that will conduct electricity well.
Any type of metal, water with dissolved substances, etc.
400
What device converts electrical energy into mechanical energy (movement)?
electric motor
400
What naturally occurring feature protects our planet from harmful solar winds?
Earth's magnetic field
500
For a material to be magnetized, how do its domains need to be aligned?
The domains need to be oriented in the same direction to be magnetized.
500
In modern homes, what type of electrical circuits are used to insure many appliances and machines can run simulataneously?
parallel circuits (instead of series circuits)
500
A strand of Christmas lights has one bulb go bad, now the whole string doesn't light up. What type of circuit is this?
This is a SERIES circuit.
500
If a tornado knocks down a wire carrying electricity, what should you use in an emergency to move the "hot" wire?
wood or other insulator to avoid being electrocuted
500
What machine creates electricity in hydroelectric dams and wind turbines?
generator
500
How is an electric motor like the opposite of a generator?
Motor--uses electricity and magnets to create movement
Generator--uses movement and magnets to create electricity