Summary A Level AQA Physics Electricity revision notes

Resistance
Basics in a Thermistor
superconductivity prope
of
Electricity
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Resistance ↳ tem
Temp
+




Current superconductor -
mater
Elections ofcurrentvibrate with the atoms within
Electriccurrent -


flow
rateof of their flow y belo
↳ charge current I
resistance has
I temp vibratemore
I e.g. Mercury
- -
measured more
measured in Amperes (A) using
(A) Ammeter
- Current
↑ temp resistance crit.temp. 4.2K
Q It I connected
=




1
50 through
a
=



=




charge (c) <time(s)



·votivecopperminanofimpshvenganseen
series m
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· In electrical wires - currentis flow of
erons s
an
> Application ofsuperconduct
·
conventional current- >
positive flow of negative charge
electrons
·
useful for large current requ
↳ positive strong magnetic
·



to
negative
terminal reduction of
energ
·




Potential Difference ↳ used in:

I
·
MRI scanners
done unitof
charge
work
per -
measured in volts
·
Transformers & gen
↳ voltmetre
work done (5) using - MOTOR



4.b*V w
↳> connected
through Electromagnets
=




·




parallel
i
·
Microchips
charge (1) -



power electrical cable

Resistance Electricity
7
to current OHMS LAW
·

opposition
shared in ohms
-




↑ For conductor to remain at
resistance ↓
·




voltage one volt
per
=




a constant temp, current

↓ ampere
current should be to
proportional
D.D. across it.
I constantconstant
resistance]
measured in m
e.g. copper our G00D
·

coNBUCiOR
-

resistance
=



ofa
temp ①
( ·property
m

Resistance ofa conductor ratio PD:current
Resistivity describin
properly
·
->
ofthe
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in it ·
all materials have resistance tow