speakers
how is sound produced in a speaker?
when a vibrating object creates sound waves in the air
What are the poles on a magnet?
North and south
what are conductors?
a material that allows energy to flow easily
What are the uses of electromagnetism?
acceleration of objects, lifting heavy objects, magnetic levitation, and
what does it mean for an object to be ferromagnetic?
The object can be magnetized
What sides of the magnet repel each other?
the equivalent sides
what is static electricity?
build up of negative charge in an area
Why are copper wires used in electromagnets?
to carry electrical current around the core
What three materials are ferromagnetic?
iron,nickel, and cobalt
where are the strongest points in a magnet?
at the poles
what is a parallel circuit?
a circuit that has multiple paths that electricity can follow
Why do electric currents produce a magnetic field?
electric currents are made by magnets
what areas are affected by the magnet?
all areas around it
what is a disadvantage of a series circuit?
if one breaks, they all stop working
Who discovered that electrical currents can be used to produce a magnetic field?
Hans Christian Oersted
What is a mineral that is naturally occurring that is magnetic?
magnetite/lodestone