Flashcards in Chapter 7 TEST Deck (22):
The North Pole of one magnet is attracted to what pole on a different magnet?
The opposite one... The South Pole!
You can increase the strength go an electromagnet by...?
Adding loops to the coil
An electric fan plugged into a wall outlet runs on what kind of current?
The current in an electric motor comes from what?
The amount of current flowing
Reaction between like poles? Reaction between unlike poles?
Same poles repel and opposite poles attract
What three materials can be used to create a magnet?
Iron cobalt and nickel
When a current is passed through a coil of wire with a piece of iron inside what is formed?
And electromagnet is formed
An electromagnet is a what?
A temporary magnet
Adding more turns to the wire coil does what to the strength of an electromagnet?
Increases the strength
Electromagnets change electrical energy into what kind?
Electrical to mechanical energy
And electric motor contains what that is free to rotate between the poles of a permanent, fixed magnet?
It contains an electromagnet that is free to move
An electric motor changes what energy into mechanical energy?
Electric to mechanical energy
A coils magnetic field can be flipped by doing what in the coil?
Reversing the direction of the current flips the magnetic field
In a motor, a reversing switch that rotates with an electromagnet is called what?
In a motor, the stronger the magnetic field in the coil, the weaker/stronger the force between the perme at magnet and the electromagnet?
The stinger magnetic field in the coil the stronger the force is
The speed of an electric motor can be controlled by varying the amount of what to the motor?
A generator contains what three parts?
Permant magnet, electromagnet and a source of mechanical energy
When the wire loop of a what turns an electric current is produced?
The current produced by a generator is what kind of current?
A motor uses or creates an electric current as it turns?
A deuce that increase or decreases voltage of electric current passing through a power line is a what?