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3 7 . T okning ishi va q u w a ti
78 6 . C h o ‘n ta k fo n ari lam p o ch k asi sokoliga 3,5 V, 0,28 A
deb yozilgan. Ish rejim idagi q arsh ilik va iste’m ol q ilin a d ig a n
quvvatni top in g . C h o ‘gManma la m p a b allo n ig a 220 V , 60 W
deb yozilgan. Ish rejim idagi to k k u ch i va q arsh ilik q a n c h a
boMishini toping.
78 7 . 220 V k u ch lan ish g a m oM jallangan e le k tr p litk a d a
ikkita spiral boMib, ish rejim ida h a r birining qarshiligi 80,7 Q ga
teng. T arm o q q a uzgich-ulagich yo rd am id a bitta spiralni, ikkala
spiralni k e tm a -k e t yoki parallel h o ld a ulash m u m k in . H a r
qaysi ho i u c h u n quvvat q a n c h a boM ishini to p in g .
7 8 8 . C h o ‘gM anm a la m p a to lasi s irtid a n m a te ria ln in g
bugManishi va ch a n g la n ish i tufayli u in g ich k alash ib q oladi.
Bu iste’m ol q ilin a d ig a n q u w a tg a q a n d a y t a ’sir k o ‘rsatad i?
78 9 . N im a u c h u n ele k tr q izdirg ich asb o b larn in g spirallari
so lish tirm a qarshiligi k atta boMgan m a te ria ld a n q ilin ad i?
790. T em peratura 0 d an 30° С gacha
0
‘zgaiganda chulg‘am i
m is sim d an qilingan elek tro m ag n it iste’m ol q ilinadigan quvvat
nech a p rotsentga o ‘zgaradi?
79 1 . Stol ustiga q o ‘y iladigan «Slava» e le k tr so ati EYK
1.5 V va sigMmi 6 A • s o a t
1
boMgan 373 e le m e n tid a n to k b ilan
1.5 yil t a ’m in la n ad i. S oat shu m u d d a t ich id a q a n c h a energiya
iste ’m ol qilishini va so atn in g q u w a tin i toping.
1
E le m e n tn in g sigMmi u z a ry a d s iz la n is h i v a q tid a b e r a o lis h i m u m k in
boM gan z a ry a d b ila n o M c h a n a d i (1 A ■
s o a t = 3 6 0 0 ° C ).
112
79 2 . E lektr lam pa ballonida 220 V, 100 W yozilgan. Sovuq
h o ld a c h o ‘g ‘lan ish tolasi qarshiligini o ‘lch ash u c h u n lam paga
2 V k uchlanish berildi, b u n d a to k kuchi 54 m A boMdi. V olfram
to la n in g c h o ‘g ‘lan ish te m p e ra tu ra sin i ta x m in a n to p in g .
79 3 . 220 V ga moMjallangan lam pa ПО V kuchlanishli
tarm oqqa ulandi. Lam paning quw ati nom inal quw atga qaraganda
nech a m arta o ‘zgardi? A gar qarshilikning tem peraturaga bogMiq
holda o ‘zgarishi hisobga olinsa, javobga qanday aniqlik kiritish lozim?
7 9 4 . H a r biri 120 V k u ch lan ish g a m oM jallangan, h a r
b irin in g qarshiligi 0,5 Ш d a n boMib, parallel u lan g an 10 ta
la m p a reo stat orq ali 220 V k u ch lan ish li ta rm o q d a n t a ’m in
lan ad i. R eo statd ag i e le k tr to k in in g q u w a ti q an d a y ?
7 9 5 . N im a u c h u n q u w a ti m o s ravish da 40 va 100 W
boMgan ikkita lam p an i k e tm a -k e t u la n g a n d a b irin ch i lam pa
ikkinchisiga q a ra g a n d a a n c h a ravshan y o n ish in i tu sh u n tirib
berin g . Im k o n i boMsa, tajrib a qilib k o ‘ring.
7 9 6 . E le k tr p litk a tu z a tila y o tg a n d a s p ira li d a s tla b k i
u zu n lig in in g 0,1 u lushga kaltalash tirild i. B u n d a p litk a n in g
q u w a ti n e c h a m a rta o ‘zgargan?
7 9 7 . Tezligi 13 m /s boMgan elek tro v o zn in g to rtish kuchi
380 k N . K o n ta k t ta rm o q n in g k u ch lan ish i 3 kV va sakkizta
d v ig a te ln in g h a r b irin in g c h u lg ‘am id ag i to k k u ch i 230 A
boMsa, elek tro v o zn in g FI К q a n c h a boMishini toping.
7 9 8 . M assasi 11 t boMgan tro lley b u s 36 k m /s o a t tezlik
b ilan h a ra k a tla n m o q d a . A gar k u ch lan ish 550 V va FI К 80%
boMsa, dvigatel c h u lg ‘am id ag i to k k u ch in i to p in g . H a ra k a t-
lanishga q arshilik koefTltsiyenti
0 , 0 2
ga teng.
7 9 9 . K o‘tarish k ra n in in g e le k tr dvigateli 380 V k u ch la-
n ish d a ishlaydi va 20 A to k k u ch i iste’m ol qiladi. A gar kran
m assasi 1 t boMgan yukni 19 m b alan d lik k a 50 s d a k o ‘tarsa,
q u rilm a n in g F I К q an d a y ?
8 0 0 . K esim i 0 ,8 4 m m
2
boMgan nik elin sim d an 220 V ga
m o M ja lla n g a n q iz d ir g ic h e le m e n t ta y y o r la s h va u n in g
y o rd a m id a 20° С dagi 2 /s u v n i 10 m in u td a q ay n a tish u c h u n
nik elin sim d an n e c h a m e tr olish lozim ? FI К = 80 %.
8 0 1 . E le k tr q ay n a tg ic h sp iralin in g qarshiligi 160 £2. Shu
q ay n a tg ic h ich id a 0,5 / suv boMgan idishga tu sh irilib , 220 V
kuchlanishli ta rm o q q a ulandi. Idishdagi suvning tem peraturasi
20° C . 20 m in oMgach, spiral ta rm o q d a n uzildi. A gar spiralning
FI К 80% boMsa, q a n c h a m iq d o rd a suv q aynagan?
8
— A .P .R im k e v ic h
113
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