section of experiment one. Next, we attached both multimeter cables before the resistor R6 (starting with the red cable)
to measure the current passing through it. A value of 8.39 mA was displayed by the multimeter which represents our
measured value. For our calculated value, we calculate equivalence resistance
Req
= (1
.
5
K//
680) + 1
K
= 1467
.
89
(
Ω
)
then we calculate equivalence current in that circuit
Ieq
= 12
/
1467
.
89 = 8
.
175
mA
after that
I
6
0
=
Ieq
= 8
.
18
mA
because
12V is in series with the resistor R6.
In Fig 3 top right, we set up the circuit to calculate the current (I7") passing through resistor R7.
However, this
time we shorted the 12V voltage source.
We attached the multimeter cables after the resistor.
A measured value of
2.69 mA was displayed by the multimeter.
In addition, for the calculated value, we calculate equivalence resistance
Req
= (1
K//
680) + 1
.
5
K
= 1904
.
76
(
Ω
) then we calculate equivalence current in that circuit
Ieq
= 5
/
1904
.
76 = 2
.
63
mA
after that
I
7” =
Ieq
= 2
.
63
mA
because 5V is in series with the resistor R7.
Finally, for Fig 3 bottom left, we were required to measure the current (I8) passing through resistor R8. However, for
this part of the experiment, we were asked to keep both voltage sources (12V and 5V) attached to the circuit. We then
proceeded by attaching the multimeter cables before the R8 resistor. The measured value displayed by the multimeter
was 4.15 mA. For our calculated value,
I
8 =
I
8
0

I
8” = (1
.
5
K/
(680+1
.
5
K
))
*
8
.
175
m

(1
K/
(1
K
+680))
*
2
.
63
m
= 4
.
06
m
.
If we take a look at the percentage error columns in table 2, we can observe that the highest percentage error that we
3
got was 3.9 percent. Which means that we were accurate in our measurements. However, the percentage error values in
this experiment were higher than percentage error values in the previous one.
Figure 3: Superposition Measurements
4.2
Second Experiment
Between A’ and B’
Between A’ and C’
Between B’ and C’
M
¸ easured
Calculated
% of Error
Measured
Calculated
% of Error
Measured
Calculated
% of Error
2.13k
2.14k
0.46
1.68k
1.695k
0.88
0.886k
0.881k
0.57
Table 3: Stardelta Transformation results
For this experiment, we used the stardelta transformation formula to calculate the values between the given sockets, and
we measured the values practically using the multimeter. The results we captured in table 3 state that our calculations
were accurate since the values of the measured and calculated are very close to each other; and since the values were close
to each other, the percentage of error came out to be very low. This exercise helps use find the values of resistors that
are connected neither in parallel nor series, and we could that both practically and theoretically. Doing it practically
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 Spring '19
 Electrical network, Electrical impedance