Unit 5 - Magnetism and electricity 1 Flashcards
the effect of magnet poles on magnetic material
magnetism
a material or object that produces a magnetic field
magnet
making scientific research available to others to repeat and debate
peer review
a force that arises even though objects are not touching – this is due to the interaction of fields
non-contact force
to pull towards another object
attract
the end of a magnet which is called the north pole or the south pole
pole
to push away from another object
repel
a magnet that keeps its magnetism for a long time
permanent magnet
an object that is attracted by a magnet and shows magnetic properties when in a magnetic field
temporary magnet
a type of temporary magnet that is magnetic only when an electric current passes through it
electromagnet
groups of atoms bound together that are aligned in the same magnetic direction
domain
the space in which a magnetic material feels a magnetic force
magnetic field
the ability of a solid to withstand a force
strength
to show the shape and size of a (magnetic) field
field lines
the piece of iron inside the coil of an electromagnet which makes the magnetic field stronger
core
when different people may interpret the results of an investigation differently
subjective
a measure of how good data is
reliability
when repeat tests of an investigation made by the same experimenter give similar results
repeatability
when an investigation method is repeated exactly and the same results are obtained by a different experimenter
reproducibility
how close data is to the true value
accuracy
how close measured values are for repeated results
precision
magnetic domains within a (core) liquid line up to create a weak magnetic field
geodynamic theory
magnetic field around the Earth
magnetosphere
a stream of charged particles released from the upper atmosphere of the Sun
solar wind
these are usually caused by the movement of electrons, which have a negative charge) moving in the opposite direction.
a flow of positive charge
the iron bar inside an electric bell
armature
the point at which a circuit is made e.g. a switch
contact
a device that breaks a circuit when too high a current is drawn from the mains
circuit breaker
this transfers energy by electricity and uses magnetic force to cause movement and do useful work
electric motor
a wire carrying a current moves when placed in an electric field
motor effect
current that always flows in one direction
direct current (D.C.)
