Incandescent Bulb Test
Our circuit consists of two
30V DC adjustable power
supplies connected in series
with an 100W incandescent
bulb.
For this test we applied DC in 1V steps and measured current and temperature
0V
0A
70°F Room temp
5v
0.182a
70°F Room Temp
As voltage and current goes up Filament beginning to glow slight red, red glow growing in intensity, red glow
eventually turning to a orange glow…
10V
0.237A
71°F
15V
0.269A
86°F
Filament between internal posts fully lit showing an orange color. The bulb is physically hot, but no real light being emitted.
20V
0.299A
95°F
25V
0.328A
112°F
orange glow of filament turning to more white light
30V
0.354A
125°F
35V
0.381A
128°F
As voltage is increased a fair amount of white light being emitted.
40V
0.406A
132°F
High amount of light being emitted at 45V.
45V
0.430A
151°F
Now the light being emitted is strong enough to hurt eyes without sunglass protection.
50V
0.453V
148°F
55V
0.475A
157°F
Bulb to hot to touch at our maximum applied voltage of 60VDC
60V
0.497A
158°F
Notice how high
the temperatures
is. For comparison,
here are the
internal
temperatures
recommended for
cooking a steak:
Extra-Rare: 125F (52C)
Rare: 135F (57C)
Medium-Rare: 145F (63C)
Medium: 160F (71C)
Well-Done: 170F (77C)
180
This is our measured results for the experiment.
160
140
100
Temp(°F)
80
600
Linear (Temp(°F))
60
500
40
20
400
0
0
10
20
30
40
Voltage
50
60
70
CURRENT(MA)
Temerature(°F)
120
Volt
300
Amps(mA)
Linear (Volt)
Linear (Amps(mA))
200
100
0
0
10
20
30
40
VOLTAGE
50
60
70