Magnetism
What are the two poles of a magnet?
North and South
What is the purpose of a switch in an electric circuit?
To control the flow of electricity by opening or closing the circuit.
What is an electromagnet?
A magnet created by electric current.
What is the purpose of an insulator in an electric circuit?
To stop electricity from flowing and protect people from electric shocks.
What is the flow of electric charge called?
Current
What happens when two like poles of a magnet are brought together?
They repel
What type of circuit has only one path for electricity to flow?
Name one way to make an electromagnet stronger.
Increase the number of coils around the core. OR increase the power source.
Name two materials that are good conductors of electricity.
copper, silver, gold, etc.
What is the role of a battery in a circuit?
To provide the energy or push (voltage) needed to move electric charges.
Name the 3 magentic metals
Iron, cobalt, nickel
What happens to the other bulbs in a series circuit if one bulb goes out?
All the bulbs go out because the circuit is broken.
Name one everyday device that uses an electromagnet.
electric doorbells, motors in appliances like washing machines, hard drive heads in computers, loudspeakers, relays, magnetic locks, MRI machines, and the magnetic strip on credit cards;
Name two materials that are good insulators.
rubber, plastic, glass
What happens to electricity in an open circuit?
It cannot flow because the circuit is incomplete.
What happens when a magent is broken into pieces?
Each piece becomes a smaller magnet with its own north and south poles.
Why are parallel circuits more useful than series circuits in homes?
Each device has its own path, so if one goes out, the others stay on.
How does an electric current create a magnetic field?
Moving electric charges produce a magnetic field around the wire.
Why is copper commonly used in electrical wiring?
It is an excellent conductor and is flexible.
Why does a compass needle move when placed near a magnet?
The magnetic field from the magnet interacts with the magnetic field of the compass needle.
Why is a magnetic field strongest at the poles of a magnet?
The magnetic field lines are closest together at the poles.
Draw or describe a simple circuit that includes a battery, wires, a switch, and a light bulb.
A complete loop connecting the battery to the light bulb, with a switch to open or close the circuit.
What are two advantages of an electromagnet over a permanent magnet?
Its strength can be adjusted, and it can be turned on or off.
ow can you test whether a material is a conductor or an insulator?
Use it in a circuit to see if it allows electricity to flow.
Name two ways electricity is used in nature.
Lightning, electric eels, bioluminescence, earths magnetic field