Experiment 8: AC Circuit Analysis
Faisel Tubbal, GIDP Tech Eng
1 Introduction
The topological analysis of basic ac electric circuits containing impedances and ideal ac supplies
This is a far more comprehensive form of Ohm's Law than what is in DC circuits (E=IR), just as
impedance is a far more comprehensive expression of opposition to the flow of electrons than
simple
resistance
is.
Any
resistance
and any
reactance,
separately
or
in
combination
(series/parallel), can be and should be represented as single impedance. This practical part where
we connect all the elements in breadboard and display the wave forms that generates from
function generator and the out put of the circuit in the oscilloscope. This report will check the
behaviour of the resistors and the capacitors by measuring the voltage across and the current
through each one, also it will check the impedance of a series connection of resistor and capacitor
when it supplied with ac voltage over given frequency range to determine it is variation with the
frequency.
2 Impedance of Resistors
.
In this part
sinusoidal voltage with 2.5 rms and 50Hz is generated by signal generator in order to
supply the circuit shown in Figure (2.1)
which is displayed in Ch1 of CRO (oscilloscope) (vi)
and the voltage drop across and the current flow through the resistor (1.2K
Ω) is displayed in Ch2
of CRO (Vr1) as shown in Figure (2.2) then from the wave forms the voltage across and the
current through the 1.2KΩ resistor is
recorded with the other details of the waveforms in table
(2.1) . after this
the frequency of the voltage supply is changed
over range 50Hz to 10Khz
as
shown Table (2.2) to find out if the
Impedance and the voltage across and current through the
1.2KΩ
are
affected by the frequency
or not. In other wards to find out if the resistance
(Impedance) is varied with frequency or not.
From the figure 2.2 and from measurements in Table 2.2 it can be clearly seen that both current
and voltage across the resistor are in phase and with the voltage supply as well so in resistors the
voltage across and the current through any resistors are in phase (Phase angle=0).
2.1 – Results and Measurements from CRO
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 Three '10
 Parviz
 Frequency, Resistor, Electrical resistance, Electrical impedance

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