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36 terms

electricity and magnetism

Vocab and other things to know for freshman year honors physical science... electricity and magnetism
STUDY
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magnetic fields
a force field that fills the space around every magnet or current-carrying wire... another magnet or current-carrying wire that enters will experience a magnetic field
magnetic domains
a microscopic cluster of atoms with their magnetic fields aligned
christian oersted
discovered that moving charges in an electric current produces a magnetic field in a circular pattern
oersted's discovery
more current=more magnetic field
right thumb rule
direction of current determines the direction of the magnetic field
electromagnet
TEMPORARY magnet with a field produced by an electric current; usually in the form of a wire coiled around a piece of iron
property of electromagnets
increase current, you increase magnetic field
property of electromagnets
add more turns, increase magnetic field
property of electromagnets
have a north and a south pole
property of electromagnets
when placed in a magnetic field, it will align itself along the magnetic field lines (like a compass)
property of electromagnets
will attract magnetic materials and be attracted and repelled by other magnets
galvanometer
a device that uses an electromagnet to measure electric current
electric motor
a device that changes electrical energy into mechanical energy
electric motor
contains an electromagnet which rotates freely to the poles of the permanent magnet, permanent magnet, coil, and electric current (battery)
generator
a machine that produces electric current by rotating a coil within a stationary magnetic field
transformer
a device for increasing or decreasing voltage through electromagnetic induction
related
magnetism and electricity are ___
motion of electric charges
magnetism is produced by the ___ _ ___ ___
motion of a magnet
faraday and henry discovered that electric current can be produced by ___ _ _ ___
magnetic field in a the loop
voltage is induced in a loop of wire if there is a change in the ___ ___ _ _ ___
electromagnetic induction
the phenomenon that electric current can be produced by the motion of a magnet and the voltage is induced if there is a change in the magnetic field is known as ___ ___.
faraday and henry
___ & ___ discovered that electric current can be produced by the motion of a magnet
doubles
when a magnet is plunged in and out of a coil of wire, voltage is induced in the coil. If the rate of the in-and-out motion of the magnet is doubled, the induced voltage ___
doubles
if the number of loops in the coil is doubled, the induced voltage ___
electric field
a rapidly changing magnetic field in any region of space induces a rapidly changing __ ___
magnetic field
a rapidly changing electric field induces a rapidly changing ___ ___
electromagnetic waves
the generation of electric and magnetic fields makes up ___ ___
iron, nickel, cobalt
magnetic elements
solenoid
a current-carrying wire that acts like a magnet when the current passes through it
commutator
a device for reversing the direction of a current
increases strength
more loops and a higher current through a solenoid
parts of an electromagnet
wire, power source, and iron core
step-up
used from generator to power lines
step-down
used from power lines to buildings
AC
current changes direction every 1/2 turn in an electromagnet generator
DC
1 complete circuit, 1 direction