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energy/electricty p1&2
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essy⭐️
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Cards (22)
Energy
Can't be created or destroyed, only
transferred
from one store to another
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Forms of energy
Gravitational
Potential Energy
Elastic
Potential Energy
Nuclear
Thermal
Electrostatic
Chemical
Kinetic
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Specific heat capacity
Energy required to raise the
temperature
of
1kg
of a substance by 1°C
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Power
The rate of
energy
transfer
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Efficiency
The amount of
energy
going into a system
usefully
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Energy sources
Finite
(non-renewable) - Fossil fuels, Nuclear fuel
Non-finite
(renewable) - Wind, Solar, Biofuels
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Fossil
fuels
Burned
to produce
heat
Non-renewable
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Nuclear fuel
Fused in nuclear reactors to produce
heat
Non-renewable
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Wind power
Wind used to turn
turbines
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Solar power
Light
from
sun
produces electricity
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Biofuels
Plant matter
burned
to produce
heat
Renewable
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Electricity
Flow of
charged
particles, which can be electrons or
protons
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Current
Flow of
charged
particles (
electrons
)
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Potential difference
How much energy is being
transferred
, measured with a
voltmeter
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Resistance
Measure of how much an object
resists
flow of
current
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Fixed resistor
Resistance
does not
change
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Filament lamp
Resistance increases
as
temperature increases
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Diode
Allows current to flow in
one
direction only
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Thermistor
Resistance
decreases
as temperature
increases
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LDR
Resistance
decreases
as light intensity
increases
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National Grid
1.
Power station
produces
high voltage
2.
Step-up transformer increases voltage
,
decreases current
3.
Cables distribute
electricity
4.
Step-down transformer decreases voltage
,
increases current
5. Homes receive
safe voltage
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The National Grid distributes
energy
to where it's needed
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