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physics paper 1
required practicals
rpa 4 - current/p.d characteristics
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Cards (4)
current/p.d in a RESISTOR
directly
proportional
ohmic
conductor
only in
temperature
is
constant
FILAMENT LAMP
current is not
directly proportional
to
potential difference
a
high current
increases the
temperature
which increases the
temperature
DIODE
we use an
EXTRA RESISTOR
because
diodes
are very easily
damaged
by
high current
because we use a
low current
we use a
sensetive ammeter
called a
MILLIAMMETER
you only get a
current
when the
potential difference
is
0.6
to
0.7
v
no
current
is
produced
if the
potential difference
is
reversed
because the
diode
has a
high resistance
current/pd rpa in an RESISTOR , FILAMENT LAMP AND DIODE:
use the VOLTMETER to read the
voltage
across the RESISTOR
use the
AMMETER
to read the
current
through the
resistor
record in a
table
adjust
VARIABLE resistor
to record
new
readings
reapeat several times
switch the
direction
of the
battery
(
reverse
the
direction
of p.d)
the
VOLTMETER
and
AMMETER
will give
negative
readings
plot on a
graph