Performance Of DC Circuits - FET

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7 Οκτ 2013 (πριν από 3 χρόνια και 10 μήνες)

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University of Jordan

Faculty of Engineering and Technology

Electrical Engineering Department


Electric Circuits Lab EE 219


EXPERIMENT 1

PERFORMANCE OF DC CIRCUITS


Part I:

Identification of resistors and capacitors values by color coding


Objectives:



To f
amiliarize the student with the color coding system for resistors and capacitors.



To examine various types of capacitors (ceramic, polyester, tantalum, electrolytic) and resistors
(thermal, carbon film, metal film).


Apparatus Required:



Ohmmeter



RLC meter


Procedure:

1.

Pick up three resistors according to their color coding.

2.

Use the ohmmeter to measure the resistances of these resistors and fill in Table 1, given:



3.

Check whether
%e

is within its tolerance range.

4.

Connect all the resistors in series and repea
t step 2.

5.

Connect all the resistors in parallel and repeat step 2.

6.

Repeat the above steps and fill Table 2 for three different capacitors using the capacitor color code sheet.
Use the RLC meter at the common testing station for measurement.

7.

Try to identif
y the different types of resistors according to their power ratings.




Table 1





R
1

R
2

R
3

R
series

R
parallel

R
expected











Color code











R
measured











Tolerance (%)











%e














Table 2



C
1

C
2

C
3

C
expected







C
measured







Tolerance (%)







%e










%e = %e
rror = R
measured



R
nominal

x
100%





R
nominal


Part II: Voltage and current division using resistive networks


Objectives:



To investigate voltage and current division in series, parallel, and series parallel connections.


Apparatus Required:



DC power
supply



AVO meter



Bread
-
boards or circuit modules



Connecting wires


Procedure:

A)

Voltage Division:

1.

Connect the circuit as shown in Figure 1.

2.

Set the DC supply output voltage controls to minimum.

3.

Switch ON the supply and set its voltage
V
S

to 10 V.

4.

Measure
V
AB
,
V
BC
,
V
C
,

I
, and
V
S
. Identify the voltage and current polarities using the AVO meter.
Record all the results in Table 3.



Table 3





V
AB

(V)

V
BC

(V)

V
C

(V)

I (mA)

V
S

(V)

Expected











Measured











Current Division:

1.

Connect the circuit

as shown in Figure 2.

2.

Set the DC supply output voltage controls to minimum.

3.

Switch ON the supply and set its voltage
V
S

to 10 V.

4.

Measure
V
S
,
I, I
1
,
I
2
,

and
I
3
. Identify the voltage and current polarities using the AVO meter. Record all
the results in Tab
le 4.

5.

Switch OFF the power supply and insert a 100 mH inductor in series with
R
3
.

6.

Repeat steps 2 and 3 above.

7.

Switch OFF the power supply and replace
L

with a 0.1 µF capacitor.

8.

Repeat steps 2 and 3 above.




Table 4






V (V)

I (mA)

I
1
(mA)

I
2
(mA)

I
3
(mA)


Expected











Meas.

w/o C or L











with L











with C












Part III: Nodal and Mesh Analysis


Objectives:



To apply nodal and mesh analysis to electrical networks.


Procedure:

1.

Connect the circuit as shown in Figure 3.

2.

Set the DC supplies output voltage controls to minimum.

3.

Switch ON the power supplies and set
V
S1

to 10 V and

V
S2

to 15 V.

4.

Measure
I, I
1
,
I
2
,

I
3
,
V
AE
, and

V
BE
. Record all the results in Table 5.




Table 5






I (mA)

I
1
(mA)

I
2
(mA)

I
3

(mA)

V
AE
(V)

V
B
E
(V)

Expected













Measured













e% =
meas
-

exp

x100














exp

Discussion:


1.

Do the resistors values in Part I match their corresponding color coding? Is their any resistor value not
within its tolerance?

2.

Wh
at are the tolerance and power ratings of a series combination of equal resistors? What about a parallel
combination?

3.

Do the values of the measured and calculated voltages and currents of Part IIA match?

4.

Verify KVL and voltage division from the data of Par
t IIA.

5.

From the measured values of Part IIB, verify KCL and current division.

6.

Calculate the error for all currents and voltages of Table 5.

7.

Verify KVL and KCL from the readings of Part III.

8.

List some sources of errors in the experiment.