vocab
what is a magnetic domain?
atoms with poles that line up in the same direction
how many poles does a magnet have and what are they
2, north and south
what does a galvanometer measure?
electric current
electromagnetic induction is the making of a current by changing its
magnetic field
true
what is alternating current
a current that changes direction twice during each rotation of the coil
if you break a magnet in half will you have one north pole and one south pole or a new set of magnets?
what produces a magnetic field
moving charges
name a device that uses an alternating current
Cd player, lamp, projector, phone charger etc
Earth's geographic north and south poles are or are not the same as its magnetic poles
are not
what is an electric motor
a device that changes electrical energy into mechanical energy
like poles....
repel
what does a solenoid do?
makes a magnetic field stronger
name a device that uses direct current
flashlight, small handheld fan, analog clock,etc
a compass works using what
magnetism
what are magnet poles?
the north and south poles of a magnet where its magnetic force is the strongest
unlike poles
attract
what kind of magnets are electromagnets
temporary
power lines carry what?
electricity/ electrical energy
three magnetic materials are
iron, cobalt and nickel
what is direct current?
current that flows in only one direction of a wire.
the smallest part of a magnet is its
atoms
What is a machine that changes electrical energy into kinetic energy called?
electric motor
transformers increase or decrease the voltage of an alternating....
current
the metal beams in the classroom are or are not magnetic?
are