Magnestism I
The Earth's magnetic field causes a compass needle to do this.
What is point to north?
When a loop of wire moves in and out of a magnetic field, a ___________ is produced.
What is a current?
Generators convert _____________ energy to _____________ energy.
What is mechanical to electric?
This type of transformer is used to provide 120V electricity to houses and schools for consumer use.
What is a step-down transformer?
Magnetism in a piece of magnetized iron can be weakened using one of these two methods.
What is heat it up or hammering it?
This type of magnet can be easily magnetized and demagnetized.
What is a soft magnet?
When a wire is moving parallel to a magnetic field, this much current is induced.
What is zero?
An electric motor converts ____________ energy into ____________ energy.
What is electrical into mechanical?
This is the name for a naturally-occurring permanent magnet.
What is a lodestone?
This is how magnetic strength and distance are related.
What is inversely? (A magnet get stronger as the distance gets smaller and vice versa.)
The magnetic north and south poles are not perfectly aligned with these poles.
What are geographic?
You can increase the strength of the magnetic field in a wire by doing this to the wire.
What is wrapping it into a coil?
Adding coils in a solenoid or electromagnet has this effect on the magnetic field.
What is it strengthens it?
Transformers can do this to voltage.
What is increase (step-up) or decrease (step-down)?
____________ poles repel and _________________ poles attract.
What are like and opposite?
The magnetic field of a magnet is strongest in this area of the magnet.
What are the poles?
In an AC generator, the magnitude of the electric current produced
a) depends on the loop orientation
b) varies with time
c) is zero when the loop is parallel to the field
d) all of these
What is d) all of these?
A device that produces a magnetic field by wrapping wire into a coil is called a ___________.
What is a solenoid?
Electric charges produce ________________ fields.
What are magnetic?
This is the region where a magnetic force can be detected.
What is a field?
If you place a compass near a current-carrying wire, the needle will align to ____________________.
What is the magnetic field of the wire?
Draw the magnetic field of a bar magnet (to include direction) on the board.
The magnetic field of a solenoid is typically ___________ than that of an electromagnet.
What is weaker?
A magnetic field around a current-carrying wire forms lines _______________ the wire.
What is in concentric circles around?
A transformer changes the _____________ of AC current.
What is voltage?