Electromagnetic Energy

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magnetic field
the region around a magnet where the magnetic force is exerted
magnetic field lines
lines that map out the magnet field around a magnet
compass
a device with a magnetized needle that can spin freely; a compass needle always points north
magnetic declination
the angle between the geographic north and the north to which a compass points
electromagnetism
the relationship between electricity and magnetism
solenoid
a coil of wire with a current
electromagnet
a magnet created by wrapping a coil of wire with a current running through it around a core of material that is easily magnetized
galvanometer
a device that uses an electromagnet to detect small amounts of current
electric motor
a device that transforms electrical energy into mechanical energy
direct current (DC)
an electric current flowing in only one direction (think "battery" and that the current strength can not be reduced)
alternating current (AC)
a current consisting of charges that move back and forth in a circuit (think "plug in" and that the current strength can be reduced by an electronic's built-in transformer)
generator
a device that uses an electromagnet to convert mechanical energy into electric energy (electricity)
transformer
a device that increases or decreases voltage
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