the generator effect. Flashcards
describe the effect of increasing magnetic field on magnitude induced current as coil is moved in magnetic field
as coil moves it cuts line of magnetic flux inducing current. the stronger the magnetic field the more field lines are cut per second so larger the current.
describe the effect of increasing the number of turns of wire in a coil of an induced current as the coil is moved in magnetic field.
as coil moves it cuts lines of magnetic flux inducing a current. the more turns of a wire in the coil the more field lines are cut per second so larger current.
moving coil microphones: what is suspended, how is it suspended and with what type of magnet?
a coil of wire is suspended on flexible diaphragm within the magnetic field of a permanent magnet.
moving coil microphones: what happens as sound waves hit the diaphragm and what does it cause?
the diaphragm back and forth castigated the attached coil of wire to move within the magnetic field of the magnet.
moving coil microphones: what does the movement of the coil within the magnetic field cause and what is induced in the coil as a result and why?
current and hence a potential difference to be induced in the coil.
lines of magnetic flux are cut.
why does flemings right hand rule tell us?
which direction current will flow in a generator.
what does a alternator produce?
alternating current.
in an alternator what maintains constant contact with the same sides of the coil?
slip rings.
what does a dynamo produce?
direct current.
in a dynamo what changes the coil connections every half turn, why and what still varies?
commutator.
current to the external circuit always flows in the same direction.
magnitude.
what instrument could be used to measure the potential difference?
voltmeter.
state two ways in which the maximum induced potential difference could be increased?
speed of coil.
magnetic field, area of coil.
