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Physics - Coggle Diagram
Physics
P2
power
power = energy transferred / time
unwanted energy goes into not useful stores
energy is dissipated (wasted)
current
rate of flow of electrons
potential difference
difference in potential
voltage
charge
amount of electrons
resistance
anything that slows the flow of charge
Charge flow = current x time
potential difference = current x resistance
direct
one direction of current
batteries
alternating
current direction can switch
mains electricity
Wiring
Live wire
brown
potential difference
neutral wire
blue
completes the system
earth wire
yellow green
safety wire
power = potential difference x current
power = current2 x resistance
efficiency
useful / total
to make a percentage = x100
ohmic conductors
temp is DIRECTLY PROPORTIONAL to the potential difference
straight line graph through 0
Non ohmic conductors
diodes only flow in one direction
thermistors
low resistance = high output = turn off
high resistance = low output = turn on
LDRS
low resistance = high output = turn off
high resistance = low output = turn on
changes with the current
series circuit
same current through each component
potential difference is shared
parallel circuit
potential difference is the same
current is the sum of the current on every loop
work done
energy transferred = power x time
energy transferred = charge flow x potential difference
national grid
system of cables and transformers linking power stations to consumers
power - step up - national grid - step down - house
step up/down transformers change potential difference
static changes
magnets
opposites attract
non contact force
negative electrons move off of one material and onto another
electrical fields
charged object
electrical field thats strong when close and weak when further away
force attracts the second object
can be positive or negative
P1
energy
cannot be created or destroyed only transfered
energy system
group of objects
ability to do work
energy stores
chemical
kinetic
kinetic energy = 0.5 x mass x speed2
gravitational
potential = mass x 9.8 x height
elastic
elastic energy = 0.5 x spring constant x extension2
thermal
magnetic
electrostatic
nuclear
joules
energy change = how much energy moves by a force
work = force x distance
force = mass x gravitational field strength
work = charge x potential
Specific heat capacity
amount of energy needed to raise temp of 1kg by 1 degrees
change in thermal energy = mass x SHC x temp change
P3
density
depends on the state
solid is most
gas is least
density = mass/volume
mass of a given volume of a substance