Experiment EC3 RCCircuits
VI2
– The data for section V1 and V2 is shown below. Using excel the data was
graphed and with the Linest function slope was found and used to find the time constant.
V1 time (seconds)
V1 ln(V) (volts)
V2 time (seconds)
V2 ln(V) (volts)
10
0.334
10
0.281
20
0.284
20
0.165
30
0.226
30
0.057
40
0.176
40
0.051
50
0.125
50
0.163
60
0.070
60
0.254
80
0.045
70
0.362
100
0.154
80
0.476
120
0.247
90
0.585
140
0.358
100
0.683
160
0.467
110
0.792
180
0.573
120
0.889
200
0.675
130
0.997
220
0.783
140
1.109
240
0.892
150
1.207
Slope .005
Y int 0.388
160
1.313
Uncertainty in slope
1.33E05
Uncertainty in int
0.002
Slope .010
Y int 0.0375
Uncertainty in slope
3.07E05
Uncertainty in int
0.003
Slope = 1
therefore
τ
=  1
τ
S
V1
τ
= 1
= 200 seconds
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V2
τ
=
1
= 100 seconds
.010
VI4
 In this section the data for V 3 is shown below. Using excel the data was graphed
and with the Linest function slope was found and used to find the time constant.
V3 time (seconds)
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 Spring '11
 st
 Slope, Harshad number, 20 30 40, V2, V2 τ, Linest function slope

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