Shane Holbrook, Jordon Kurz Experiment 1: Measurement of Resistance hursda! September "rd, #$1% &nstructor Michael 'ombs
(b)ecti*e: The purpose of this experiment is familiarization of the ohms function of the multi-meter, and exposure to various resistors by use of equip ment and various color coded resistors. This is accomplished by being given real world activities such as reading the ohmmeter, potentiometer, and differentiating of any given g iven resistor.
Materials: The materials used were: Eight various resistors, and two alie resistors, one potentiometer !via the "hoto-#oard "#-$%& trainer', and one (lue ))* multi-meter. multi-meter.
+rocedures: (irst we had to acquire the needed materials from the designated locations. This includes the trainer, and the )% resistors. The (lue ))* multi-meter was brought by +ordon from home to use in the lab. fter the equipment was obtained and instructions were given from r. ombs, we then began to further investigate the instructions from our wor order !lab boo'. /e than begin to write down the various color codes from each resistor in order as we placed them into the trainer. fter we had recorded all of the obtained resistors, we then beg an to tae note of the measured values of each resistor on page )0 of our lab boos. 1nce these were recorded, we then concluded with finishing up the difference in percentage, and writing in the color-code value of each resistor. (rom here we then begin to study the potentiometer function of the trainer. /e /e then recorded our values with wor order instructions following from page )) from our lab boos. fter this was completed we determined the remainder of the required lab through depiction of the given color codes and values.
indin-s: (or Table Table 0 which was the measurement of the resistors we gathered the following information:
Resistor
'olor of .and
st
1 #rown
%
) 0 & 8 $ 9 *
ellow #lue #rown 3ed 1range #rown 1range
; =
#rown #rown 2reen
)%
#n d 2reen
"urple 2rey 2reen
#lac #lac #rown
'olor/
Measured
'ode 0alue
0alue
2ifference
3 th 4ilver
).$
).895
60.*7
2old 2old 2old 2old 2old 2old 2old
56)%7 8*%56$7 9;%56$7 )$%56$7 0*%56$7 &&%56$7 )%%56$7 &=%.$56$
89$5 9;%5 )$$5 09*5 &095 =;.95 &;9.$5
6).%97 6%7 6&.&&7 6).))7 6).)07 6).87 6%.=%7
2old 2old 2old
7 )56$7 )%%56$7 $.)56$7
%.=;95 =;.85 $.%$5
6).87 6).97 6).%%7
"r d 3ed
#rown #rown #rown #rown #rown #rown #rown
3ed #rown red
Then we were to determine the resistance of the terminals of the potentiometer on table & page )& of our lab boos. The results were as follows:
Step
Step 3: otal otal resistance bet4een terminals 1 and " 5 ).)%&5 Shaft +osition Resistance Measured .et4een: erminals 1/# and erminals #/"
Sum of Resistance Readin-s
% 7 8
''6 '6 1 / 2 CW
).$5 ).) 5 $$% 5
).) 5 ).0 5 $*% 5
)$%).) 5 ))%).0 5 ))0% 5
'onclusion: fter accessing the information given from the experiment one can gather that indeed the resistors color code is a clear indicator of its actual ac tual resistance. This is determined from Table 0 in which each value was first listed, the color code value then deciphered, and then measured. s is clearly indicated the percentile difference of each measured resistor shows that they are indeed in tolerance. The only thing one could determine from the results of Table 0 is that due to the >, that the readings due tend to fluctuate a bit, although due in part to the (lue ))*, it was quite accurate in its readings. The very con cept of this lab is to learn about ohms, o hms, resistors, and
potentiometers. The measurement with the (lue ))* ))* and trainer was quite depictive, and informative. The potentiometer portion of the experiment ? feel could have been a bit more elaborate, as ? now there are different types of potentiometers !such as linear and nonlinear', ? did gather quite a bit of information from the results. ?t could be adequately determined from our readings that from terminals one and two, that they tended to fluctuate from positions in increments of around 8%%-$$% 5. Then with terminals two and three it fluctuated around )%%-9%% 5, which is quite a difference. @ow it is nown that when measuring a potentiometer that terminals one and two have a fixed resistance between them and that is the total resistance, where the actual resistance will vary between the terminals when you move the contact. 1verall the experiment was a good introduction to resistance, the trainer, potentiometers, and resistors.
urther &n*esti-ation: The further investigation portion was covering the resistance of five-band color-coded resistors. The results were as follows as is listed in Table Table 8 page )& of our lab boos:
Resistor 1st
$
.ro4n
'olor of .and #nd "r d 3th
Red
0iolet
.ro4n
'olor/
Minimum
Maxim
'ode
0alue
um
19#3 k 5
0alue 19"$k
% th
Red
0alue 1 9# 8 k
1
2reen
#
1range
"
/hite
3
0iolet
%
.ro4n
1range
1range
=reen
=reen
#lue
#lue
#lue
.lack
.lack
#lac
2reen
3ed
=old
.lack
#rown
5 ;# %"7 5
$&%.9= 5
$8).&9
3ed
; 1 "9"$M
&0&8 5
5 &&99
#rown
5 ; # <897k
=9908 5
5 =;$*9
Red
5 ; 1 *$ 5 A 6
*&.$ 5
5 *9.$ 5
.ro4n
07 ).$ 5 A
).8;$ 5
).$)$ 5
6 )7
>pplication +roblem: −2
1.06 x 10
lthough this answer is a bit off, it is still as close as ? could manag e to get. ? came to this conclusion by first moving the equation around. The equation gave the resistance, coefficient of resistance in ohms-meters, and diameter of a wire, more investigation was still needed. (irst thing that had to be done do ne was converting the diameter to cross-sectional area.
Cross sectional Area Area =
1 2
2
diamet diamete e r x π
1 2
( 6.38 x 10 ) π =3.1969161 x 10 −4
−7
(or easier calculations ? will simply this number to: to: −7
3.20 x 10
@ow we can reloo at the equation as:
L=
P A
/ R
Which will look like this: −8
10
L=1.69 x
−7
/5
3.20 x 10
Which would calculate to shows us the needed length: −2
1.06 x 10
E*aluation and Re*ie4 ?uestions: ). . no #. 2et another meter and retest. 0. )-0 A ).$5 for 0-& A ).)5 &. a. #rown, 3ed, #lac, 4ilver b. #lue, 2ray, 3ed, 4ilver
c. 2ray, #rown, #rown, 4ilver d. ellow, ellow,
