Robert Cinca - Physics
The relationship was tested experimentally with two different filament bulbs, using
the circuit seen in Figure 1. By varying the resistance in the circuit, I adjusted the
The
with two
different
bulbs,
using
final relationship
current and was
was tested
able to experimentally
measure the surge
current
times filament
for different
final
the
circuit I seen
in Figure
By varying the using
resistance
in the and
circuit,
I adjusted
the
currents.
recorded
all my 1. measurements
a voltage
current
data logger,
final
current
and (a
was
able to program),
measure the
surge
for against
different
final thus
and data
studio
computer
which
let current
me plot times
current
time,
currents.
I recorded
all my
measurements
enabling me
to measure
the
surge current using
time. a voltage and current data logger,
and data studio (a computer program), which let me plot current against time, thus
An
excel me
spreadsheet
was
used
to see
if the filament bulb can be effectively
enabling
to measure
the then
surge
current
time.
4
modeled as a hot body radiator . The power, , radiated by the filament is given by:
An excel spreadsheet was then used to see if the filament bulb can be effectively
modeled as a hot body radiator 4 . The power, , radiated by the filament is given by:
(Where is the emissivity of tungsten, is Stefan-Boltzmann’s constant, is the
surface area of the filament, and is the temperature of the filament in Kelvin.
(Where is the emissivity of tungsten, is Stefan-Boltzmann’s constant, is the
surface area of the filament, and is the temperature of the filament in Kelvin.
4 “Emissivity”, Higher Level Physics (Hamper, 2009) p298
4 “Emissivity”, Higher Level Physics (Hamper, 2009)
23 p298
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