Andrés Nichrome Investigation corrected

8/12/2019 Andrs Nichrome Investigation corrected

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Year 11 Physics Andrs Bereznev

Investigating the resistance of a Nickel- Chrome wire

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Table of Contents

Investigating the resistance of a Nickel- Chrome wire1!a"le of Contents#Introd$ction%&esign'&ata Collection ( Processing1)

Concl$sion ( *val$ation11Ill$strations1+

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Introduction

Variables spider diagram

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Ilustracin 1: Variables spider Diagram

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Introduction

!he e,eriment was to set $ to investigate how the length of a nichrome wire changes itsresistance !he e,eriment was started with . cm and was increased . cm after each setof res$lts !he otential difference and c$rrent thro$gh the wire was meas$red and then

the otential difference was divided "y the c$rrent to get the resistance $sing the e/$ation023I Potential difference is the amo$nt of energy 45o$les6 $sed in a comonent in thecirc$it7 it8s meas$red in volts C$rrent is the amo$nt of electron flow thro$gh a fi,ed oint ina fi,ed time 0esistance is the oosition to the assage of an electric c$rrentthro$gh thatcond$ctor !he deendent varia"le in this investigation is the resistance7 while theindeendent varia"le is the length of the wire

.

9enght ofwire

:idth ofwire

!emerat$reof wire

0esistanceof Nichrome

wire
http://en.wikipedia.org/wiki/Electric_currenthttp://en.wikipedia.org/wiki/Electric_current


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Illustration 2: Diagram of set up apparatus

Design

Aim

!o investigate how the length of a Nickel chrome wire changes its resistance

Discussion of variables (variables table)

Variable Type How will you change it and what range of values will you use?

Length of

wire

Independent Use crocodile clips to change the length of the

wire used in the circuit. This is increased from 5

cm to !! cm by 5 each time.

Variable Type How will you measure it as accurately as possible?

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Prediction

Illustration 3: Predicted grap of results

I think that as the length of the wire increases its resistance increases I think therelationshi "etween the length of the wire and its resistance is roortional I think this"eca$se if

Apparatus list

Nickel chrome wire of )%. mm wide and 1 meter long

Crocodile clis

:ires

Ammeter and 2oltmeter or# m$lti meters

A ower s$ly like # cells

0esistor

1 meter r$ler


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Diagram

Illustration !: Diagram of set up apparatus

"etod

1 =et $ the aarat$s as shown in the diagram

Illustration #: Diagram of set up apparatus

>

1 ?eter


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# =et the voltmeter to #)2 direct c$rrent% =et the ammeter to # Ameres+ =et the varia"le resistor to ma,im$m resistance in order to lower the c$rrent to the

minim$m ossi"le val$e. !he volt meter has to "e connected to the Crocodile clis7 not the Nichrome wire

' ?ore the Crocodile cli connected to the volt meter and the resistor to the left $ntilthe distance "etween the two crocodile clis or the length of the wire reaches . cm

; P$sh the switch and record the voltage and c$rrent assing thro$gh the . cm ofwire

Add . cm "y moving the crocodile cli moved "efore7 $sh the switch and record

three times again1)@ee adding . cm to the length of the wire tested $ntil yo$ reach 1)) cm7 recording

three times every set of res$lts11sing the average val$es calc$late the resistance in each set of res$lts "y $sing the

e/$ation 023C7 0esistance2oltage3C$rrent

1#:hen yo$ get all the sets of res$lts average each set "y adding the three0esistances together and then dividing "y three

1%0 4average6 4010#0%63%1+0ecord yo$ res$lts in a data ta"le

Data $ollection % Processing

&esults

Resistance (R)/ Voltage (V)/V Current (I)/A

T1 T2 T3 Averag

e

T1 T2 T3 T1 T2 T2

0,79

0,79

0,71

0,7 0,11

0,11

0,10

0,1!

0,1!

0,1!

1,"!

1,2

1,"!

1," 0,20

0,21

0,20

0,13

0,13

0,13

2,1"

2,0#

2,1"

2,13 0,2#

0,27

0,2#

0,13

0,13

0,13

3,00

2,#"

3,00

2,9" 0,3

0,37

0,3

0,12

0,13

0,12

3,7

3,7"

3,7"

3,72 0,!!

0,!"

0,!"

0,12

0,12

0,12

!,3

3

!,!

2

!,3

3

!,3 0,"

2

0,"

3

0,"

2

0,1

2

0,1

2

0,1

2",!

"",3

",2

7",3 0,

00,"

90,"

#0,1

10,1

10,1

1

",!

,"0

",#2

",9# 0,2

0,"

0,!

0,11

0,10

0,11

7,00

7,10

#,00

7,37 0,70

0,71

0,#0

0,10

0,10

0,10

7,"0

7,0

,91

7,3! 0,7"

0,7

0,7

0,10

0,10

0,11

'abla 1: &esults

Average resistance 4!1!#!%63%

*,amle 4)7;>)7;>)7;163%Average)7;'

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Analsis

Illustration : *rap of results

$onclusion % +valuation

$onclusion

!he grah shows a ositive correlation "etween the 9ength of the wire7 meas$red incentimetres7 on the , a,is and the resistance7 meas$red in Dhms7 on the y a,is !herelationshi is roortional as it is a straight line assing thro$gh 4)7 )6 !he e/$ation forthis relationshi is y )7);.


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the wires always at the same temerat$re !he "est cooling system to $se co$ld "e waterr$nning aro$nd the wire7 this wo$ld carry all the heat away from the wireAnother "ig ro"lem was that most of the "atteries rovided were discharged ca$sing avery little voltage7 or no voltage at all to flow in the circ$it :hen a lower voltage isrovided "y the "atteries7 the range of the res$lts recorded decreases ca$sing the res$ltsto "e less acc$rate For e,amle the res$lts for the first three $sing a good ower s$ly

co$ld have "een 12 for the first one7 #2 for the second and %2 for the third one7 while$sing a weak ower s$ly they co$ld "e )7#2 for the first7 )7.2 for the second and )7;2for the third one As we can see from the e,amle a"ove7 thee range "etween the val$eswith low ower s$ly is very small and therefore the attern on a grah wo$ld "arely "eseen

:ith low voltage s$ly

Illustration ,: +-pected results .it a lo. voltage suppl

Good voltage s$ly

Illustration /: +-pected results .it a good voltage suppl

In this two images we can see that we can see a clear relationshi in the e,eriment with a

good voltage s$ly and we don8t see a clear relationshi in a e,eriment with low owers$ly "eca$se the range of res$lts is very small

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Another "ig iss$e was the "ad contact in the switch and the ca"les !he val$es wereshifting $ and down and they seemed to "e steady only when all contacts were hardly$shed together !he ro"lem was that the harder we $shed7 the more acc$rate val$es"ecame7 "$t we did not maintain the same force with which we $shed the contactstogether7 therefore having a lack of acc$racy in the res$lts

*,amle

Illustration 0: +-periment set up .it bad contact

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Illustration 1: +-periment .it good contact

Illustrations

Il$straciHn 1 2aria"les sider &iagram+Ill$stration # &iagram of set $ aarat$s'Ill$stration % Predicted grah of res$ltsIll$stration . &iagram of set $ aarat$s>Ill$stration ' Grah of res$lts11Ill$stration ; *,ected res$lts with a low voltage s$ly1#Ill$stration *,eriment set $ with "ad contact1%

Ill$stration 1) *,eriment with good contact1+

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Andrés Nichrome Investigation corrected

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