Show:
Magnetism from Electricity
Circuits and Currents
Electricity from magnetism
Vocab
Free fun
100
Why are electromagnets useful?
They can be turned on and off as needed.
100
What is electric current, and how is it measured?
Rate at which charges pass through a given point; measured in amperes (A)
100
What is an electric generator?
A device that converts mechanical energy into electrical energy.
100
What is a magnet?
Any material that attracts iron or things containing iron.
100
How can you make an electromagnet stronger?
Increase the number of loops per meter in the solenoid.
200
That is an armature?
A loop coil of wire that can rotate.
200
What is a series circuit?
A circuit in which the parts are joined one after another such that each current is the same.
200
What is a transformer?
A device that increases or decreases the voltage of alternating current
200
What is voltage, and how is it represented?
The potential difference between two points; measured in volts (V)
200
In a magnet like charges ______.
Repel
300
What does a galvanometer measure?
Measures current.
300
What is a direct current?
Charges always flow in the same direction.
300
Name two scientists credited with discovering that a magnetic field could make an electric current.
Michael Faraday Joseph Henry
300
What is an electrical conductor?
A material in which charges can move freely.
300
How do maglev trains work?
They float because of magnetic forces between the track and train cars?
400
What did Hans Christian Oersted discover?
The relationship between electricity and magnetism.
400
What is a parallel circuit.
circuit in which the parts are joined in branches such that the potential difference across each part is the same.
400
What does a transformer do?
Increases or decreases the voltage of alternating current
400
What is static electricity?
Electric charges at rest; generally produced by friction or induction.
400
What is electromagnetism?
The interaction between electricity and magnetism.
500
What is an alternating current?
What is charges continually shift from flowing in one direction to flowing in the reverse direction.
500
What is electromagnetic induction?
Process of creating a current into a circuit by changing a magnetic field.
500
What is electric discharge?
Release of electricity stored in a source.
500
In magnets different charges________.
Attract