Richland College

Engineering Business & Technology

Rev. 0 – W. Slonecker

Rev. 1 (8/24/10)– J. Bradbury

DC Circuits

CETT 1403

DC Circuits Lab 05

Parallel Circuits

Name: ____________________________________ Date: ____________________

OBJECTIVES:

To analyze Parallel Circuits for R, I, and V.

To analyze Parallel Circuits by calculations and by

measurements.

MATERIALS:

DC Power Supply: 0 35 Volts

Digital Multimeter

Breadboard

Resistors: 680 Ω, 1.2kΩ, 2.2kΩ

NOTE: On a calculation sheet, draw the schematic, label the parts and values.

Show the readings taken at the points on your schematic. Record

answers and findings on these lab sheets.

PROCEDURES:

I

1. Enter the color code and the measure value of the following components.

Resistor

Color Code

Measured Value

R

1

=

680 Ω

_________

____________Ω

R

2

=

1.2 kΩ

_________

___________kΩ

R

3

=

2.2 kΩ

_________

___________kΩ

II

2. Set up the following circuit. Using the color code and measured values

from step 1 calculate I

T

and R

T

.

Using color code values.

Using measured values.

Calculated I

T

= _____

mA.

Calculate I

T

= _____m

A.

Calculated R

T

= _____kΩ.

Calculate R

T

= _____kΩ.

Measured I

T

= ______mA

Measured R

T

= _____kΩ

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1

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4

III

1. Set up the following parallel circuit.

2. In a parallel circuit the following formulas apply.

1/R

T

= 1/R

2

+ 1/R

3

(R

Ta

)

R

T

= R

2

R

3

/(R

2

+ R

3

) (R

Tb

)

R

T

= V

T

/I

T

(R

Tc

)

3. Using the proper measuring procedures complete Table 1.

MEASURED

CALCULATED

V

R2

=

XXX

V

R3

=

XXX

I

R2

=

I

R2

=

I

R3

=

I

R3

=

I

T

=

I

T

=

R

T

=

R

T(a)

=

XXX

R

T(b)

=

XXX

R

T(c)

=

Table 1

4. Measure R

T

with power supply

OFF

but in the circuit: R

T

= _____.

Measure R

T

with power supply leads removed: R

T

= _____.

Why the difference?

5. Draw the equivalent series circuit for the parallel circuit shown in step

2.

Label and show the values of all components in the equivalent circuit.

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4

IV

1. Set up the circuit shown below. (see step II for calculating R

T

’s.)

2. Complete Table 2. Do your calculations and schematic on a separate sheet,

showing formulas used to obtain the results. Attach sheet to lab.

MEASURED

CALCULATED

V

T

=

XXX

V

R1

=

XXX

V

R2

=

XXX

V

R3

=

XXX

I

T

=

I

T

=

I

R1

=

I

R1

=

I

R2

=

I

R2

=

I

R3

=

I

R3

=

R

T

=

R

T(a)

=

R

T(b)

=

R

T(c)

=

Table 2

3. Draw the series equivalent circuit, label and show the value of components.

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4

V

1. Visual Representation of what you did:

! ! FILL IN THE BLANKS ! !

How much current flows through section, A_____, B_____ and C_____?

CONCLUSION:

What I learned from this lab: (Use back of this page as needed.)

What still confuses me:

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