VI Characteristics and Energy Meter Calibration
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Transcript of VI Characteristics and Energy Meter Calibration
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E x pe r im e n t N o . 1
V I C H A R A C T E R I ST I CS OF I N CA N D E SC E N T L A M P &W I R E W O UN D R R E O ST / LT
A I M : a ) T o p lo t the V I c ha r a c te r ist i c s o f 2 in c an de s c e n t la m ps (60W & 100W ) w he nc o n n e c t e d i) s e par a t e ly i i) in s e r ie s & ii i) In par a l le l
.
b) T o plo t t he V I c har a c te r is t ic s o f a w i r e w o u n d r he o s ta t (l in e ar r e s is ta n c e )
A PPA R A T U S :
S. N o . Na m e o f t h e
a p p a r a t u s
V o l tm e t e r
T yp e R a n ge
'
(0 250v j(0 - 30V )(O- 1 A )(0 5A )500
, 5A
90,
8. 5A
230V, 60 W
230V, I 00W
Qu a n t i ty
A m r i ie t e r
Rhe o s ta t W ir e w o u n d
In c a n de s c e n t L a m p
P RJN C I P L E :
A r e s ist a n c e is l in e a r , i f i t s V - I c ha r a c t e r is t ics is a s t r ai ght l in e pas s in g thr o u gh o r ig i n
o r if it o be y s Ohm s la w.
F o r a l in e a r r e s is ta n c e,
the v a l u e o f r e s is tan c e r e m a in s c o n s ta n t
i r r e s pe c t iv e o f the v o l t nge a c r o s s o r c u r r e n t tho u gh it W i r e w o u n d r e s i s ta n c e (u s u a l ly m a d e
o f n i c k e l c hr o m i u m a l lo y ) i s a n e x a m p le o f a l in e a r r e s is ta n c e .I n t a s e o f a n in c a n d e s c e n t
l a m p (m ad e o f t u n g s t e n f i l Bm e n t ) , i8 r e s i s ta n c e i n cTe a s e s a s the c u m n t in c r e a s e s . I f a dc
v o l ta ge is s u dde n ly a pp l i e d,
the in i t ia l c u r r e n t m ; y be tw e l v e t i m e s i t s n o r m a l o pe r a t in gc u r r e n t . 1h is l s be c a u s e the r e s in a n c e o f a c o ld t u n gs t e n f i la m e n t is a bo u t m 2 ' h
o f the
r e s i s ta n c e a t o pe m t i n g te m p e r a t u m
PR O C E D U R E :
A ) I N C A N D E SC E N T L A M P
M a k e the c o n n e c t i o n s a s sho w n h f ig u r e (N o t e : 60W la m p is c o n n e c t e d) K e e p in g the
a u to M n s f o r m e r a t m in im u m v o l t a ge po s it io n, s w it c h On t he s u pp ly A qju s t the
a u to tr a n s t b r m e r a n d tbr d i f fe r e n t v a lu e s o f v o l t a ge, n o t e the Ain m e te r an d v o ltm e t e r r e a d in gs
R e pe a t th e p r o c e du r e by c o n n ¢c t in g i) 100W lam p in pla c e of 60W l a m p i i) 100W a n d 60Wl a m p In s e r i e s en d l i i) 100W & 60W in pam l le l P l o t V I c ha r a c t e r i s t ic s f o r e B c h c a s e in the
s a m e g r a ph.
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116 £ k i n u T u k b l d Ee£ t e e t m £l t 1ui t qEe i ¢u u n i l e · 4 7 eo t t
B ) W I RE W O UN D R E SI ST A N C E
M a ke th e c o n n e c t io n s as sho w n in f igu re K ee p in g t he
v o lta ge po s i t io n l s w i tc h o n the SUpp ly Fo r v a r io u s I rjt io
v o l tm e t e r & am m e t e r r e a d in gs P lo t V I c ha J
0 5A M C
0 8 5A
T A B U L A R A N C E
V o l tm e te r
R e a d in g1N o
A m m e t e r
Re a d in g
v o lts
W ir e w o u n d
re s is ta n c e
I m i m p s>
RE SU L T
a) V I c h a m c t e r is t ic s o f 6 0
i e p a r o t e ly i i ) i n se r i e s
b ) V I c h a r a c t e r is t ic s o f W
100W i n c a n pes c e n t la m ps pl o n I L he n c o n m
e l
plo t t e d
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I A
M I 00W 100W & 60W 100W & 60W
IN SERE S IN PA RA U EL
T A B U L A R C O L V M N I N C A N D E SC E NT L A M P
V o l tm e t e r \
S l N o R c : ig 6601 1 I 00 W
A m m e t e r R e a din g I
60 & 10 0 W in
s e r i e s
m I-00 W in
A V m v o lts¬OW & l OUW
In s e r i e s
60 W
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E x p r i m \ t N o . 2
! L , T I O N B Y
A I M : m e te r u s in g w a t tm e tc r by d i r e c t lo a d i n g
A P P
! g Ou n n t i tv
W i r e w o u n d
n am o m et e r
I n du c t i o n
250V, 5A
, UPF
240 V,
5A
PR I N C I P L E :
Jo f r e v o l u t i o n s m a d e by a n e n e r gy m e t e r i n a g i v J
e n e r gy s u pp l i e d I n t h is c o n n e c t i o n , a t e r m c a l le c
d a s t he n u m be r o f r e v o lu t i o n s m a de
in t e r v a l o f t im e is P
m e t e r c o n s t a n t is u s e d
T he v a lu e o f m e t e r
m a r k e {M m e t e r
H e r e , t h e
c u m n t a n d v o l t a g e a r e
m e t e r d is c i s m e a s u r e d
th e e n e r gy m e t e r i s a w a t t m e t e r a s
c o n s t a n t d u r i n g t lle t e s t T im e t fo r N ,
l ly
s ta n d a r d T he
o n o f t hc e n e r gy
PR O C E D U R E :
M a k e th e c o n n e c t io n s a s s ho w n in C
Pr e c a u u o n s / I n i t ia l s e t t i n g s :
i) Sw i t c h D P ST in o pe n po s i t i o n
i l) A u t o t r a n s f o r m e r in m in i m u m v o 1 s it io n
i i i) A l l th e r he o st a t s a t m a x im u !n po s i t io n
Sw i t c h o n th e s u pp ly by c lo s in g D PST s w i t c h A t ju s t t he a u t o tr a n s f o r m e r a n d m a k e the
v o l t m e t e r r e a d in g e qu a l t o r a t e d v o l t a ge (= 230V ) By v a r y in g th e r he o s ta t,
a dj u s t t h e c u r r e n t
t o a s u i t a b l e v a l u e (s n y I 5A ) N o t e do w n t he v o l tm e t e r,
am m e l e r a n d w n t tm e t e r r e a d i n g s
A ls o , n o t e t h e t im e fo r 5 r e v o l u t io n s o f t h e e n e r g y m e t e r d i s c I n c r e a s e t h c c u r r e n t a n d r e p e a t
th e a bn v e p r o c e d u r e A l t e r c o m p l e t in g t h e e x p e r i m e n t,
s w i t c h o f f t h e s u pp ly b y h r in g m g a l l
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