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Osnove fizike 2 Predavanje Mirko Planinić PMF Osnove fizike 2

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Mirko Planinić 1

Osnove fizike 2

Predavanje

Mirko Planinić

PMF

Osnove fizike 2

Mirko Planinić 2

Test iz struja

mean= 43,34 %

Page 3: Osnove fizike 2 Predavanje - unizg.hrplaninic/nastava/OF2/... · Table 25.2 Temperature Coefficients of Resistivity (Approximate Values Near Room Temperature) 0.0043 0.00000 0.00088

Mirko Planinić 3

Uvod

Page 4: Osnove fizike 2 Predavanje - unizg.hrplaninic/nastava/OF2/... · Table 25.2 Temperature Coefficients of Resistivity (Approximate Values Near Room Temperature) 0.0043 0.00000 0.00088

Mirko Planinić 4

Smjer struje

Page 5: Osnove fizike 2 Predavanje - unizg.hrplaninic/nastava/OF2/... · Table 25.2 Temperature Coefficients of Resistivity (Approximate Values Near Room Temperature) 0.0043 0.00000 0.00088

Mirko Planinić 5

Struja teče

Page 6: Osnove fizike 2 Predavanje - unizg.hrplaninic/nastava/OF2/... · Table 25.2 Temperature Coefficients of Resistivity (Approximate Values Near Room Temperature) 0.0043 0.00000 0.00088

Mirko Planinić 6

Konceptualno pitanje

Pretpostavite da zamijenite žicu sa žicom dvostruko većeg promjera .

Kako će to utjecati na iznos driftne brzine ako struja u žici ostane ista?

a) driftna brzina će ostati ista

b) driftna brzina će biti duplo veća

c) driftna brzina će biti četiri puta veća

d) driftna brzina će biti duplo manja

e) driftna brzina će biti četiri puta manja

Page 7: Osnove fizike 2 Predavanje - unizg.hrplaninic/nastava/OF2/... · Table 25.2 Temperature Coefficients of Resistivity (Approximate Values Near Room Temperature) 0.0043 0.00000 0.00088

Mirko Planinić 7

Otpornost je svojstvena

metalima (kao i gustoča)

Page 8: Osnove fizike 2 Predavanje - unizg.hrplaninic/nastava/OF2/... · Table 25.2 Temperature Coefficients of Resistivity (Approximate Values Near Room Temperature) 0.0043 0.00000 0.00088

Mirko Planinić 8

Otpornost i temperatura

Pokus sa zavojnicom i tekućim dušikom i

pokus s grijanjem vodiča plamenikom.

Page 9: Osnove fizike 2 Predavanje - unizg.hrplaninic/nastava/OF2/... · Table 25.2 Temperature Coefficients of Resistivity (Approximate Values Near Room Temperature) 0.0043 0.00000 0.00088

Mirko Planinić 9

Konceptualno pitanje

Održavate konstantno električno polje unutar komada poluvodiča

dok smanjujete temperaturu poluvodiča. Što će se desiti gustoći struje

u poluvodiču?

a) porasti će

b) smanjiti će se

c) ostati će ista

Page 10: Osnove fizike 2 Predavanje - unizg.hrplaninic/nastava/OF2/... · Table 25.2 Temperature Coefficients of Resistivity (Approximate Values Near Room Temperature) 0.0043 0.00000 0.00088

Mirko Planinić 10

Otpor je važno svojstvo

(kao masa)

Page 11: Osnove fizike 2 Predavanje - unizg.hrplaninic/nastava/OF2/... · Table 25.2 Temperature Coefficients of Resistivity (Approximate Values Near Room Temperature) 0.0043 0.00000 0.00088

Mirko Planinić 11

Otpornici su označeni bojama

Page 12: Osnove fizike 2 Predavanje - unizg.hrplaninic/nastava/OF2/... · Table 25.2 Temperature Coefficients of Resistivity (Approximate Values Near Room Temperature) 0.0043 0.00000 0.00088

Mirko Planinić 12

Odnos struje i napona

Page 13: Osnove fizike 2 Predavanje - unizg.hrplaninic/nastava/OF2/... · Table 25.2 Temperature Coefficients of Resistivity (Approximate Values Near Room Temperature) 0.0043 0.00000 0.00088

Mirko Planinić 13

Računanje otpora cilindričnog vodiča

kojim struja ide radijalno

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