Electromagnetism

Key Words

Magnetic field - a region where other magnets or magnetic materials experience a force.

Magnetic field lines - lines that show which way a force would act. They go from north to south.

Compasses - show the directions of magnetic fields.

Permanent magnets - produce their own magnetic field.

Induced magnets - magnetic materials that turn into a magnet when they're put into a magnetic field.

Solenoid - a coil of wire that increases the strength of the magnetic field.

The Motor Effect - a current-carrying wire is put between magnetic poles it caused the magnet and the conductor to exert a force on each other.

Conductor - a material that allows energy to pass through it.

Magnetic flux density - how many field (flux) lines there are in a region.

Electromagnet - a magnet that runs of electricity.

The Generator Effect - creates a potential difference in a conductor and a current if the conductor is part of a complete circuit.

Potential difference - the driving force that pushes the charge around (volts V).

Alternators - generate alternating current.

Dynamos - generate direct current.

Oscilloscope - show how the potential difference generated in the coil changes over time.

Microphones - loudspeakers in reverse.

Transformers - change the size of the potential difference of an alternating current.

Step-up Transformers - step the potential difference up.

Step-down Transformers - step the potential difference down.