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2 Sensing




Revision Guide for Chapter 2


Contents
Revi
si
on
C heckl
i
st

Revi
si
on
N ot
es


El
ectr
ic
current
and
charge
El
ectr
on
bea m
Pot
en t
ial
di
ff
erence
Conductance and r
esist
ance
Par
a l
l
e l…

Page 2

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2 Sensing




Revision Checklist

Back
to
li
st
of
C ont
ent
s

I can show my understanding of effects, ideas and
relationships by describing and explaining:

h ow
e l
ectri
c currents
are
a fl
ow of
c har
g ed
p art
icl
e s
e.g. an…

Page 3

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2 Sensing




t
h e acti
o n
of a pot
e nti
a l
divider

e.g. in sensor applications such as to sense position or angle, reduce a potential
difference, produce a potential difference from a change in resistance

Revi
si
on
N ot
es:
pot
ent
ial
di…

Page 4

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2 Sensing




I can use the following words and phrases accurately:

w i
th ref
e r
en ce t
o el
e ct
ri
c c i
rcuit
s :
emf, potential difference, current, charge,
resistance, conductance, series, parallel, internal resistance, load

Revi
si
on Notes:
el
ectr
ic…

Page 5

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2 Sensing




curre nts, ci
rcui
t
re si
stance and potent
ial
di
ff
e r
ences in
paral
lel
ci
rcui
ts
usi
ng
the
con d ucta nces
of comp onents
e.g. total conductance = sum of component conductances

Revi
si
on
N ot
es:
conduct
ance…

Page 6

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2 Sensing




Revi
si
on
N ot
es:
uncer
tai
nty,
gr
aphs


consi
der
ing
ways
to
reduce
the
lar
gest
sour
ce
of
uncer
tai
nty
in
an
exper
iment


Revi
si
on
N ot
es:
accur
acy
and
preci
si
on,
uncer
tai
nty




I can show…

Page 7

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2 Sensing




Revision Notes

Back
to
li
st
of
C ont
ent
s

Electric current and charge
El
ect
ri
c cur
rent
i
s char
ge
fl
ow per
uni
t
ti
me:






whereI
is
cu r
rent
and Q i
s t
h e
charge f
low i…

Page 8

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2 Sensing




An
elect
ron beam i
s usual
ly
contr
oll
ed usi
ng el
ectr
ic
an d
ma gneti
c f
iel
ds.
T he
kinet
ic
en er
gy
and
speed of
an el
ectr
on i
n an el
ectr
on beam depend on t…

Page 9

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2 Sensing






Back
to
R evi
si
on
C heckl
i
st



Conductance and resistance
Conductance
is
a me asur
e of
how wel
l
a component
i
n a
cir
cui
t
conduct
s el
ect
ri
ci
ty.

Conduct
ance i
s def
ined
as





The symb ol…

Page 10

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2 Sensing





Circuit rules:
1.T h e potenti
al
dif
ference acr
oss comp onents
in
parall
el
is
the
sa me for
each comp onent.

2.T h e current
thr
ou gh
a paral
lel
comb i
nati
on i
s equal
to t
he sum of
the curr…

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