1. O‘tkazgich temperaturasini o‘zgarmas qoldirib, undan o‘tayotgan
tok kuchini oshirsak, uning qarshiligi…
A)o‘zgarmaydi B)oshadi
C)kamayadi D)oshishi ham kamayishi ham mumkin
3. Mis simning 50 ºC dagi qarshiligi 2 Ω, 100 ºC dagi qarshiligini
(Ω) toping. Mis uchun qarshilikning termik koeffitsienti 0,004 K
–1
ga teng.
A)2,33 B)4,6 C)1,1 D)0,5
4. Temperaturasi 0 ºC bo‘lgan alyuminiyning qarshiligi 3 marta
ortishi uchun qanday temperaturagacha qizdirish kerak (ºC).
Alyuminiy uchun qarshilikning termik koeffitsienti 4·10
–3
K
–1
ga
teng.
A)300 B)600 C)500 D)900
5. G‘altakning mis simi 25 ºC da 11 Ω qarshilikka ega. 100 ºC
gacha isitilganda, uning qarshiligi necha Ω bo‘lishini baholang. Mis
uchun qarshilikning termik koeffitsienti 4·10
–3
K
–1