Show:
Electric Currents
Electric Circuits
Magnetism
Electricity and Magnetism
Miscellaneous
100
the flow of negative charges through matter
What is electric current?
100
a circuit that connects several objects in a single path
What is series circuit?
100
an object that attracts iron and steel
What is a magnet?
100
a machine that uses an energy source and a magnet to make electricity
What is a generator?
100
Name two conductors
possible answers: copper, metal
200
a measure of how much a material opposes the flow of electric current and changes electric current into heat energy.
What is resistance?
200
a circuit that connects several objects in a way that the current for each object has its own path.
What is parallel circuit?
200
the space around a magnet where magnetism acts
What is a magnetic field?
200
when electric current runs through a loop of wire, it makes this
What is an electromagnet?
200
Name two resistors
possible answers: rubber, plastic
300
an electric current passes easily through a wire that is this
What is conductor?
300
you do this, every time you turn a light on
Close an open circuit
300
the force around a magnet
What is magnetism?
300
List three ways you can generate electricity.
1. by moving a magnet back and forth through a coil or wire 2. by sliding a coiled wire back and forth along a magnet 3. by spinning a coiled wire around a magnet
300
a small magnet that can turn freely
What is a compass?
400
something that an electric current does not easily pass through
What is insulator?
400
What happens in a series circuit is one part of the circuit is removed or turned off?
Electric current cannot flow through the circuit. The circuit is open.
400
Where magnetism is at its strongest
What is pole(s)?
400
Explain how Christian Oersted discovered that electricity and magnetism are related.
Oersted noticed that when electric current flowed through a wire, a compass needle pointed toward the wire.
400
a magnetic rock
What is a Lodestone
500
You walk across a thick carpet and reach out to turn on a light switch. Explain why you feel a shock.
As you walk, your body picks up negative charges from the carpet. When you touch the switch, the negative charges move from your hand to the switch. You feel this as a shock.
500
Name a way to use electricity safely.
possible answers: not using frayed, cut or broken electric cords; no overloading circuits; by not touching electric cords, appliances or light switches when wet; by moving paper away from electric heaters; and by unplugging appliances not in use.
500
you hold the south poles of two magnets near each other, what happens?
they repel each other
500
Explain how electromagnets are used to make electric power.
Generators have huge electromagnets with huge coils of wire and magnets. they use a power source, such as nuclear energy or coal, to move the magnet and produce electricity.
500
Explain what causes the northern lights.
Charged particles from the sun are pulled and pushed into patterns in the sky near the Earth's magnetic poles. When these particles react with gases in the air, they make the northern lights.