Exp 1

‫بسم الله الرحمن الرحيم‬

‫جامعة بوليتكنك فلسطين‬ ‫كلية الهندسة والتكنولوجيا‬

‫‪.electric Lab‬‬ ‫‪Experiment No. 1‬‬

‫‪The Basic Resistance‬‬ ‫‪Measurements‬‬

‫‪Done By:‬‬

‫عائد زهران‬

2007/2008 : Objective the first learn reading the resistors _1 about two method a. resistor color code b. measure on digital .multimeter to be familiar using the digital _2 . multimeter . measured percentage error _3 . direction for use the bread board _4 learn measure the equivalent _5 resistance of series and parallel circuit . theoretical and experimental

: Theory resistor color code ( start the first _1 color and second color regeistor ,third color but *10x ,the final color it percentage error ,such as Blue-red-green-gold . ( 105Ω ±5%*62= ±5%-6-2-105

= (percentage error (PE _2 theoretical – experimental/

* 100%/

Theoretical resistor _3 ……+equivalent(Req)series=R1+R2+R3+R4 Req (parallel)=R1*R2*R3*R4 R1+R2+R3+R4 :(result and digrams(data of table :table 1

resist or

1 2 3

(Color code(Ω

Blue_gray_black_red Brown_black_brown_ gold

Nominate d (value(Ω

Measur ed value ((Ω

680Ω ±.1% 100Ω ±5%

635Ω 6.62%

102Ω±10*10 Brown_black_red_sliv % er

:Table 2

Percenta ge value (%)

96Ω

4%

1.02kΩ

2%

: Calculation From table 1 calculate the percentage error 6.62%= 100%*

/680-635/ =

680 From table 2 calculate the Req Req=68+33=101Ω -1 Req=(120*220)/(120+220) =22.2Ω -2 ≠circuit

Req(calculat (e

(Req(measure

1

Ω 101 Ω 100 2 Ω 22.2 Ω 22.1 3 383.83 Ω 398 Ω 4 k 0.711 kΩ 0.709 Ω =560*680 + 100*330 -3

Req =307.09+76.744=383.83Ω 100+330

560+680

Percentageerror

1% 0.45% % 3.7 0.28%

0.711Ω = 4.396*0.848 *1 68*4.7 ║= =5.6 4- Req 68+4.7 5.6+1

4.396+0.848

And percentage error=/101-100/ *100% =1% 101 …Etc

: Conclusions I can’t measured the resistance of a -1 resistor while that resistor is in a circuit but must be removed the resistance from .the circuit and then measure to learn methods measure the amber -2 and the voltage on the digital multimeter .