Summary AQA A level Physics notes - Electricity

Unit 04
Electricity

, 01 CURRENT ELECTRICITY

1 Basics of Electricity
Potential Energy
For an electric circuit to work ,
it needs to have a

Electric Current source of potential Energy (PE)

# can be provided with a
charge carriers ↑




·y
batteries/cells W




wire
·
Electric current :




rate of flow of charge
around the
-current
circuit
always flows n-
from + positive - -



negative &


terminals of the source ELECTRIC CURRENT &

. ↳ ⑰]
I X
I
of PE
-created by movement

of charge carriers
↓ Battery/cell
charged particles)
Flow of Current is OPPOSITE to Flow of Electrons



2 types of
charge carers



/ W
Elections
Ions
- -




In metals
-




-free to move around
-e free to move around
in a solution of dissolved salt
their structure bic of the

way metal


metallic substances
atoms wi

are bonded
Ex) NaCI
Nat]
I
lows that

the
carry
charge



when wire is not wire is carrying
carrying current current

27 *
I
5-7 -7
5⑧ 088
⑧-
->
⑧ ⑧ 00 ⑧ ⑧ -
-
I


I ↑ I Y !
⑧ ⑧ & ⑳- ⑧
-
=0
& OEDEDED1
E I - I I E

Y
⑧->⑧ 80
*O↑0 I -
0+ 8-8+070- 0
I
I
Free Electrons metal Atom Free Electrons