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كورس ثاني ت6

The document outlines Experiment No. 6 in an Electrical Circuits Laboratory, focusing on the characteristics of an R-C ac circuit. It details the objectives, theory, procedure, and measurements to be taken, including calculations for phase difference angles and total impedance. Additionally, it includes instructions for plotting graphs and discussions related to the experiment's findings.

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30 views2 pages

كورس ثاني ت6

The document outlines Experiment No. 6 in an Electrical Circuits Laboratory, focusing on the characteristics of an R-C ac circuit. It details the objectives, theory, procedure, and measurements to be taken, including calculations for phase difference angles and total impedance. Additionally, it includes instructions for plotting graphs and discussions related to the experiment's findings.

Uploaded by

jolyaanmed
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Department of Electronic and Communications Electrical Circuits Laboratory (II)

================================================================================

Experiment No.6

R-C ac Circuit

Objective: To study the characteristics of ac resistor-capacitor (R-C) circuit.


Theory: The R-C ac circuit composes of two elements, resistor (R) and capacitor (C).

These two elements are either connected in series (or in parallel)

depending on nature of application under study. In the R-C ac circuit, it is

known that the current leads the voltage by a phase difference angle ( θ or

φ ). The value of this angle zero and π/2 and can be determined by one of

the three method which have been mentioned in exp5.

Procedure:
1- Connect an R-C series ac circuit according to the following block diagram.

Osc. Ch1

820Ω
Resistor
10Vpp sine Osc. Ch2
Wave generator
0.1uF
Capacitor
Probe

2- Power on the instruments and write-down your measurements as shown in


following table (assume phase angle of current is zero).
Department of Electronic and Communications Electrical Circuits Laboratory (II)
================================================================================

3- Calculate the value of phase difference angles θ1 and θ2 where θ1=2πft and
θ2=tan-1(VL/VR) for each value of frequency.
4- Calculate the circuit total impedance in polar and rectangular forms for each
value of frequency

f (Hz) 500 700 800 1000 1200 1400 1600 1800 2000 2200
(IT)p mA 1.5 1.65 2.3 2.7 3.1 3.4 3.55 3.87 4.05 4.25
(VR)p V 1.2 1.7 2 2.2 2.5 2.8 3 3.2 3.3 3.5
(Vc)p V 4.7 4.5 4.3 4.2 4 3.8 3.6 3.4 3.2 3
(VT)p V 5V 5V 5V 5V 5V 5V 5V 5V 5V 5V

.t (-usec) 410 272 221 172 139 100.4 83.2 69.4 60 52


.θ1 (-deg) 73 68.5o 63.6 62 60 51 48 45 43.2 41
.θ2 (-deg) 75.7 69.3 65 62.3 58 53.6 50.2 46.7 44 40.6
ZT 𝟑𝟑𝟑𝟑 𝟑𝟎𝟑𝟎 2174 1852 1613 𝟏𝟒𝟕𝟑 1408 𝟏𝟐𝟗𝟐 𝟏𝟐𝟑𝟓 𝟏𝟏𝟕𝟕
polar ∠𝟕𝟑 ∠𝟔𝟖. 𝟓 ∠𝟔𝟑 ∠𝟔𝟐 ∠𝟔𝟎 ∠𝟓𝟏 ∠𝟔𝟑 ∠𝟔𝟗 ∠𝟔𝟎 ∠𝟓𝟐
974 + 1110 + 987 + 869+ 806+ 927+ 639+ 463+ 617+ 725+
ZT rect. j 3187 j2819 j1937 j1635 j1396 j1145 j1255 j1206 j1070 j827

5- Plot on a graph paper VT and IT for f=500Hz.


6- Repeat steps 1 to 4 for R-C parallel circuit.

Discussion
1- Plot on a graph paper between the frequency and phase difference angle.
2- Draw on a graph paper the phasor diagram for the case f=500Hz (choose a
drawing scale 1cm for each 1 volt).
3- Are IT , VR and VL increasing or decreasing with the frequency f ?Why?.
4- What should be the phase difference between VC and VR ?
5- Repeat the discussion for R-C parallel circuit.

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