| A | B |
|---|
| magnetic fields flow from... | north to south |
| like poles (N an N or S and S( | repel |
| unlike poles (N and S) | attract |
| what are the three materials that can make magnets? | iron, nickel, cobalt |
| magnetic field | the field that exerts a magnetic force |
| domains | a large group of atoms with aligned poles that produce a magnetic field |
| What is the geographic locations of the magnetic south pole? | geographic north pole |
| What is the geographic location of the magnetic north pole | geographic south pole |
| What produces earth's magnetic field | magnetic ores (mostly iron) in the earth's core |
| electromagnet | a temporary magnet made by wrapping a wire coil carrying a current around an iron core |
| commutator | part of an electric motor or generator - the brushes make contact with this split metal ring in order to conduct electricity, each time the brushes make contact with the split in the ring the electron flow is reversed |
| permanent magnet | a magnet made from iron, cobalt, or nickel where the domains stay aligned |
| termporary magnet | a magnet in which the domains align due to the field of another magnet or an electric current |
| electric motor | a device that uses a permanet magnet and an electromagenet to transfrom electrical energy into mechanical energy |
| turbine or generator | a device that makes use of a permanent magnet and an electromagnet to transform mechanical energy into electrical energy |
| galvonometer | an instrument that is used to detect current |
| Adding more turns to the wire coil ________ the strength of an electromagnet | strengthens |
| Removing more turns to wire coild __________ the strength of the electromagnet | weakens |
| solenoid | a single wire carrying a current wrapped into a cylindrical wire coil |
| brushes | small metal pieces that connect the current source to the commutator in a generator or electric motor |
| in a straight wire, magnetic fields flow __________ the wire | in a circle around |
| in a coiled wire magnetic fields __________ of the coil | create a north and south pole at each end |
| if you reverse the flow of electrons through a wire you __________ of the magnetic field | change the direction |
| step-up transformer | increases the voltage of an alternating current |
| step-down transformer | decreases the voltage of an alternating current |
| increasing the number of turns in the secondary coil in a transformer __________ the amount of voltage that goes out | increases |
| decreasing the number of turns in the secondary coil of a transformer ______________ the amount of voltage that goes out | decreases |
