Summary Electricity & Circuits GCSE/IGCSE

.



Electricity
Focus points
. Electric flow of charges
i




ii. Current

iii. Voltage (potential difference and electromotive force
iv . Resistance
.
v Conventional flow d current
vi. Electron flow



Electric change value Potential difference work done moving a
i




. iii. - in


1 . 6x10-19 C unit +ve charge across the
-

Since electric charges are of component and transferring
twotypes ( + ve and-rel the energy from electrical to
-ve Charge value will be 1 6 x10-19 .
non-electrical form
work done

ii. Current-Rated flow of charge
v =
/




/menanavan I
campere
t pd .
Charge
a = &4 S0 ,
work done per unit
Charge
= charge .




current time
se
#
. . m .
f = work done in moving a unit I ve

charge across the cell and
transferring from non-electrical
to electrical form .

Electricity- flowd electrons in a
closed circuit.
Cell -
one the and-re
terminal .




Battery -
collection of
Cells .

, Ohm's Law-Current is directly proportional to Directly proportional (graph
applied p d provided temperature
.
i. line must pass through
remains Constant
origin .
.



ii. Must be straight line .




Resistance= potential difference per
unit current (ohm &l .




V = IR
R
= voltmeter used
to measure e m f
. .




U

M


wit.
t




-

v -


voltmeter used to
measure p d .




-
Ammeter are connected in series .
Voltmeter are connected in parallel .