EAST WEST UNIVERSITYDEPARTMENT OF EEE

Course code: EEE 201Course name: Electrical circuit ΙΙ

Lab reportExperiment no: 02

Experiment name: Experimental study of sinusoids and their characteristics.

Student name: Syed AbothoheId: 2011-1-80-023

Section: 02Group no: 06

Date of performance: 31-01-2012Date of submission: 07-02-2012

OBJECTIVE: In this experiment we observed the characteristics of sinusoids in oscilloscope, using a simple ac circuit. We have learnt how to use oscilloscope, and how

to take reading from it.

CIRCUIT DIAGRAMS:

Figure 01-Circuit diagram

EXPERIMENTAL DATA: Voltage (V) Capacitance (C) Resistance (R) Angular freq. (W)

10 V P-P 1miroF 100Ω 2*3.14*1000rad/s

ANSWER TO THE LAB-REPORT QUESTIONS:

1. Amplitude voltage, Vm= 3.44 V= Vm/√ 2= 3.44//√ 2

=2.43 V

COMPARING:Value of ‘V’ from voltmeter Value of ‘V’ from oscilloscope

2.8 V 2.43 V

2. Im= 0.034 A I= Im/√ 2

=0.034/√ 2=0.024 A

COMPARING:Value of ‘I’ from voltmeter Value of ‘I’ from oscilloscope

0.0179 A 0.024 A

3. Impedance, Zm= V/I θ= 2.43/ 0.024<57.6

= 101.25<- 57.6Xc= 1/ (6283.2*1*10^-6)

=159.15ΩImpedence, Z= R- jXc

= 100- j159.15=187.96<-57.86

COMPARING:

Impedance from measured values Impedance from calculated values101.25<- 57.6 187.96<-57.86

4. Impedance angle, θ = tan-1 (Xc/R)= tan-1 (159.15/100)

= 57.86

Phase difference, θ = 58.13

COMPARING:

Impedance angle, θ Phase difference, θ57.86 58.13

5. The graph.

Time

0s 0.5ms 1.0ms 1.5ms 2.0ms 2.5ms 3.0msV1(V1) 1000000000* V2(R1)

-5.0V

0V

5.0V

1.094ms = time when the voltage of resistor reaches to its peak value.1.255 ms = time when the input voltage reaches to its peak value.0.160 ms = time delay.

1ms = one period.(0.161*360) = 57.96 = corresponding phase difference.Signal 2 leads signal 1 by 57.96

Comment: We got some difference among values. But they are very small, so we can ignore them.

Discussion: In this experiment we introduced some new things like capacitor, oscilloscope. We also learnt how set value in the oscilloscope and how to get values.

1. In this experiment we are introduced two new circuit elements called Capacitor and inductor.

2. We learnt how to calculate capacitance and inductance values in complex numbers.

3. We also introduced with the oscilloscope machine, and learnt how to use it.

4. We measure voltages across the resistance, capacitor as well as inductor and we found waves with the respective values.

5. Oscilloscope does not show the current wave across any circuit elements. But we can see the current wave of a circuit element through its voltage and its values.

6. We also checked that phase angle changes when we change the frequency as well as the value of capacitor.

7. We saw that when we increased the capacitance value, then the phase angle decreased but the frequency was same.

8. We also saw that when we increased the frequency but the capacitor value was same then the phase angle also decreased.