physics paper 1 revision Flashcards
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Evolution of small or medium star
Nebula
Protostar
main sequence star
red giant
white dwarf
black dwarf
evolution of large star
nebula
protostar
main sequence star
red supergiant
supernova
black hole or neutron star
How does a loudspeaker produce sound
Alternating current flows through wire creating magnetic field
magnetic field of coil interacts with magnetic field of magnet
the coil experiences a force and then changes direction causing the cone to move in and out
this creates vibrations and oscillations resulting in sound waves
split ring commutator
swaps pos and neg connections every half turn
direction of current also swaps resulting in travelling in the same direction
how to increase speed of rotations of a coil
increase current
add more turns
more powerful magnets
what is electromagnetic induction
wire experiencing changes in magnetic field
how to changer size of induced potential difference
change strength of magnets
move wire faster
shape wire into coil
change strength of current
increase strength
increase speed
add more turns
electromagnetism
current produces own magnetic field
magnetic field in solenoid
strong
uniform
how to increase magnetic strength
increase current
increase number of coils
decrease length of wire
add iron core
motor effect
current carrying wire in magnetic field experiencing force
flhr
index is mag field
middle is current
thumb is force
permanent mag
produce mag field all the time
induced mag
temporary mag field
