Table 7. The calculated voltages for this procedure
Point
Calculated
Voltage ()
Measured Voltage ()
Percent Difference
A
2.35
2.41
2.49%
B
0.09
0.05
80.0%
C
1.64
1.67
1.80%
D
1.24
1.27
2.36%
Table 8. The calculated currents for this procedure
Around Loop
Calculated
Current ()
Measured Current ()
Percent Difference
1
0.265
0.258
2.71%
2
0.254
0.247
2.83%
3
0.132
0.134
1.49%
Question 3.
How much power did the whole circuit consume? Demonstrate how you calculated
it.
Conclusion
If there is one thing this experiment demonstrated completely successfully, it’s the
amount of time using a circuit editor like
Multisim
can save when analyzing circuits. Even with
help of a computer, the time and effort to formulate and transform the equations by hand is
simply incomparable with the efficiency of simulating the circuit in a near instant with use of a
program. However, with that out of the way, this lab also showed the correct usage of nodal and
mesh analysis. By applying Kirchhoff’s Laws to applicable circuitry, one can find everything
about a circuit by hand, albeit arduous and tedious.
Error between calculating the values by hand and by simulating in
Multisim
is practically
nonexistent. Any discrepancies arise simply due to rounding differences, and in this regard the
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calculations are almost certainly more accurate. Error between these two and the
measured results was almost always at 1%3%. One outlier, however, is the astonishing 40% and
80% differences between the simulation and measured results and between the hand calculation
and measured results in Tables 5 and 7, respectively. With closer examination, one can see that
the large error is simply due to the incredible smallness of the number. With such a small
number, any difference is going to skew the percentage error magnificently. It is also to note that
the difference between the numbers was 0.02V and 0.04V, an insignificant amount.
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 Fall '11
 Jafarzadeh
 Volt, multisim, Kirchhoff's circuit laws, Voltage drop

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