Project on Resistor

7/24/2019 Project on Resistor

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Project Work

On Physics

Subject: Resistors

NAME: asasasasasas

CLASS: XII A

ROLL NO: 0

RE!IS"RA"ION NO:


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CERTIFICATE

"his is to certi#y that this $roject

%RESIS"ORS& has been co'$(ete) by

Anisha Pau( the stu)ent o# Sssssssssssss

Schoo(* Ro+riah* ,orhat.

Subject teacher:Riju'oni Payen-

E.terna(/s si-nature:


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ACKNOWLEDGMENT

I Anisha Pau( hereby ackno+(e)-e that a(( the

)etai(s #urnishe) in this $roject are true to the

best o# 'y kno+(e)-e "his $roject entit(e)

%RESIS"ORS&sub'itte) #or the aca)e'ic year

102324 is a recor) +ork )one by 'e un)er the-ui)ance o# our bio(o-y teacher 'aa' Riju'oni

Payen- I ha5e $ut in best o# 'y e##orts to 'ake

this $roject success#u( "his is a bona #i)e recor)

o# the ori-ina( +ork )one by 'e

I ackno+(e)-e +ith -ratitu)e the kin) he($ an)encoura-e'ent recei5e) #ro' our bio(o-y

teacher )urin- the $re$aration o# the $roject My

sincere thanks are )ue to the Princi$a( 'aa'

Rinku 6or-ohain* Sssssssssssss Schoo(* #or her

constant su$$ort At the en) I +oun) (ike to

thank 'y $arents an) #rien)s #or he($ an)a$$reciation +ithout +hich is +ou() not ha5e

been $ossib(e #or us to co'$(ete the assi-n'ent


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Bibliography

i7 Pra)ee$s re#erence book

ii7 +++yahooco'

iii7 ++++iki$e)iaco'

i57 NCER" "EX" 6OO8


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INDEX

I Intro)uction

II Oh'/s La+

III 9e$en)ence

I Li'itation o# oh'/s (a+

Resisti5ity o# 5arious 'ateria(s

I Co'binations

II 8ircho##/s (a+


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IN"RO9;C"ION

A resistor is a $assi5e t+o3ter'ina( e(ectrica( co'$onent

that i'$(e'ents e(ectrica( resistance as a circuit e(e'ent

Resistors act to re)uce current #(o+ an) at the sa'e ti'eact to (o+er 5o(ta-e (e5e(s +ithin circuits In e(ectroniccircuits resistors are use) to (i'it current #(o+ to a)just

si-na( (e5e(s bias acti5e e(e'ents an) to ter'inate

trans'ission (ines a'on- other uses uitous in e(ectrica(

e>ui$'ent Its resistance s$eci#ies the e(ectrica( #unction o#

a resistor


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O


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9EPEN9ENCE

a7 Resistance on (en-th o# con)uctor:Consi)er a con)uctor satis#yin- BRI to be in the #or' o#

s(ab o# (en-th ?(7 an) cross sectiona( area ?A7

Resistance o# s(abB VI=R

No+ $(ace to i)entica( s(abs so that the (en-th beco'es 1(

an) current #(o+in- throu-ht the either s(ab is ( the$otentia( )i##erence across the en)s o# #irst s(ab is then

#or the secon) s(ab a(so is Potentia( )i##erence across theco'bination is e>ua( to the $otentia( )i##erences across

in)i5i)ua( s(abs

BB1

"he current throu-h the co'bination is (* so the resistance

o# the co'bination is* RB1IB1R

"hus )oub(in- the (en-th o# the con)uctor kee$in- area

cross section A constant )oub(es the resistance

Resistance is )irect(y $ro$ortiona( to Len-th

b7 Resistance u$on cross sectiona( area A o# a con)uctorNo+ i'a-ine )i5i)in- the s(ab into t+o i)entica( s(abs o#

(en-th ( an) area A1

Current throu-h each s(absB (1

Potentia( )i##erence across each ha(# s(absB

Resistance o# each ha(# s(ab RB I1B1IB1R

"hus +hen cross section area is ha(5e)* resistance is)oub(e)

"here#ore* resistance is in5erse(y $ro$ortiona( to area o#

cross3section

RBrho (A"he constant o# $ro$ortiona(ity ?rho7 )e$en)s on the

'ateria( o# the con)uctor but not on it )i'ension Rho is

kno+n resisti5ity or s$eci#ic resistance


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Rho= R.Al

Resisti5ity is one ty$e o# resistance +here rho an) (en-th

are unity ie rhoBR

Its unit is* rhoBoh''?17 '9i'ension o# resisti5ity: rhoBF ML?3@7"?3@7A?317G

LIMI"A"IONS O= O


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Meta(s ha5e resisti5ity in the ran-e o# 20?3H7 oh' '

to 20?347 oh' ' Insu(ators ha5e resisti5ities 20?2H7

ti'es -reater than 'eta( or 'ore Se'icon)uctors

ha5e resisti5ities in bet+een con)uctor an) insu(torsResisti5ity o# se'icon)uctors )ecreases +ith a rise in

te'$erature "heir resisti5ity is a##ecte) by the

$resence o# s'a(( a'ount o# i'$urities

Co''ercia((y $ro)uce) resistors #or )o'estic as +e((

s (aboratory use are o# t+o ty$es:

i7 Wire boun) resistorsii7 Carbon resistors

Wire boun) resistors are 'a)e by +in)in- +ires o#

a((oys ie 'a-nanin* constantan* etc "hese +ires are

chosen because their resisti5ities are re(ati5e(y

insensiti5e to te'$erature

Resistors o# ran-e hi-her than +ire boun) are 'ost(y

'a)e o# carbon Carbon resistors are s'a((* co'$actan) (ess e.$ensi5e so are +i)e(y use in e(ectronic

)e5ices

Project on Resistor

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