, linear components
graph with a
Three I - V characteristics
have
/
Unit
(resistor)
straight line ·
ampere (A)
e
Non-linear
. diodes , lamps
g . have a
components Current
curved iv characteristic ↓ electric current= rate of flow of electric charge
that shows how current, I flowing
a
graph ,
current needs
through a component changes as the
-source of potential difference (volts VI
,
it increases
potential difference, v ,
(complete]
across
to flow in a closed circuit
↑
In
ohmic conductor > have constant resistance t
DOESNT CHANGE ---
e . resistor at const temp
g ...
D
.
current has the same value
X &
everywhere
7
in a
single closed loop
current through ohmic conductor is
Y
,
the potential difference is the driving
directly proportional to
force pushing the charge around
W
potential difference
>
-
R
Ix -
ohms
-
resistance what slows the current down >
filament lamp
is
greater resistance
= smaller current
as current increases filament lamps temp increases
X4 >
: resistance
,
increases , less flows
[for a given potential difference]
current
per unit potential difference V =
IR
~
I,
diode
-
Electricity Circuit symbols
- measures current
YS > current flows through a diode
Camps] flowing through
high
↑
in one direction. resistance
circuit
In the other direction .
reversed A Ammeter
-
-
~
- If the currents
Cell
S
measure PD in volts
current flows around
X placed parallel
-
Thermistor through
+ve
useful temp detector
whats investigated
>
-
direction -
>
Ya (LONE STICK)
t
V Voltmeter
temperature dependent resistor ---
Battery
-
not conditions resistance drops R
- cool conditions resistance goes up & -
Resistor
R
temp ⑧ Switch open
Light
T
Variable
LDRs and
Sensing circuits
use
LDR
-
thermistors resistor
⑧ ⑧ Switch closed
be
Sensing circuits can used to turn o
Light dependent resistor
increase the power to
components Diode
or
conditions they're in
resistor that depends on light intensity - Bulb
depending on
-
bright light : resistance falls
EG . temp increases ,
thermistor resistence
-
darkness : resistance is at its highest *
light intensity increases
Fuse LDR
decreases takes less
: resistence falls
, potential difference
from share other
, components get more
++ appliances :
less er
needs less S G
automatic night lights -
burglar detectors
LED
and
PD
gets more PD - Thermistor
& 1
- from share
#
-
L
graph with a
Three I - V characteristics
have
/
Unit
(resistor)
straight line ·
ampere (A)
e
Non-linear
. diodes , lamps
g . have a
components Current
curved iv characteristic ↓ electric current= rate of flow of electric charge
that shows how current, I flowing
a
graph ,
current needs
through a component changes as the
-source of potential difference (volts VI
,
it increases
potential difference, v ,
(complete]
across
to flow in a closed circuit
↑
In
ohmic conductor > have constant resistance t
DOESNT CHANGE ---
e . resistor at const temp
g ...
D
.
current has the same value
X &
everywhere
7
in a
single closed loop
current through ohmic conductor is
Y
,
the potential difference is the driving
directly proportional to
force pushing the charge around
W
potential difference
>
-
R
Ix -
ohms
-
resistance what slows the current down >
filament lamp
is
greater resistance
= smaller current
as current increases filament lamps temp increases
X4 >
: resistance
,
increases , less flows
[for a given potential difference]
current
per unit potential difference V =
IR
~
I,
diode
-
Electricity Circuit symbols
- measures current
YS > current flows through a diode
Camps] flowing through
high
↑
in one direction. resistance
circuit
In the other direction .
reversed A Ammeter
-
-
~
- If the currents
Cell
S
measure PD in volts
current flows around
X placed parallel
-
Thermistor through
+ve
useful temp detector
whats investigated
>
-
direction -
>
Ya (LONE STICK)
t
V Voltmeter
temperature dependent resistor ---
Battery
-
not conditions resistance drops R
- cool conditions resistance goes up & -
Resistor
R
temp ⑧ Switch open
Light
T
Variable
LDRs and
Sensing circuits
use
LDR
-
thermistors resistor
⑧ ⑧ Switch closed
be
Sensing circuits can used to turn o
Light dependent resistor
increase the power to
components Diode
or
conditions they're in
resistor that depends on light intensity - Bulb
depending on
-
bright light : resistance falls
EG . temp increases ,
thermistor resistence
-
darkness : resistance is at its highest *
light intensity increases
Fuse LDR
decreases takes less
: resistence falls
, potential difference
from share other
, components get more
++ appliances :
less er
needs less S G
automatic night lights -
burglar detectors
LED
and
PD
gets more PD - Thermistor
& 1
- from share
#
-
L
