What is a device that uses an electric current to turn an axle?
100
A current that flows in one direction.
What is DC?
100
The scientist who graduated from the University of Copenhagen.
Who is Hans Christian Oersted?
200
True or false: An electromagnet can be turned on and off.
What is true?
200
The transformation of a generator's energy.
What is mechanical to electrical energy?
200
The transformation of an electric motor's energy.
What is electrical to mechanical energy?
200
This consists of charges that move back and forth.
What is AC?
200
A transformer that decreases voltage.
What is step-down transformer?
300
The four ways you can increase the strength of electromagnet.
What is increase the current, add more loops, wind coils closer together, and use a stronger ferromagnetic material for the core?
300
The two things the electric company uses giant generators to produce electricity for these places.
What is homes and schools?
300
The three parts of an electric motor.
What is brushes, armature, and commutator?
300
Famous person who used DC in his first electric generating plant.
Who is Thomas Edison?
300
The 4 ways to increase the strength of an electromagnet.
What is increase the current in a solenoid, add more loops to the wire of a solenoid, wind the coils of the solenoid closer together, and use a stronger ferromagnetic material for the core?
400
The reasons why a magnetic field of an electromagnet is stronger than a regular magnetic field.
What is the magnetic field can be produced by the current in the wire and the magnetic core and that it can be turned on and off?
400
How a generator and electric motor are different.
What is a generator uses motion to produce an electric current and an electric motor uses an electric current to produce motion?
400
This repeatedly reverses the flow of the current through the armature.
What is commutator?
400
The major advantage AC has over DC.
What is AC can easily be raised or lowered to a higher or lower voltage?
400
A commutator repeatedly does this to the current in an armature.
What is reverses?
500
The 6 uses of electromagnets.
What is record info on audiotapes, videotapes, computer hard drives, credit cards, doorbells, and big magnets used in places like junkyards to lift heavy stuff?
500
How an AC generator works.
What is when the crank is turned, the armature rotates halfway and reverses the magnetic field's direction and also reverses the current's direction, and then the slip rings also turn and make contact with the brushes connecting to the rest of the circuit?
500
How an electric motor works.
What is when the loop/armature gets to the vertical position, the current is reversed which reverses the direction of the movement and each of the loops move in opposite directions and the current reverses after each half turn so that the loop spins continuously in the same direction?
500
Where DC is produced and induced.
What is produced from an energy source such as a battery and induced from a changing magnetic field?
500
Doorbells, electronic games, and portable Cd's require this many volts.