the temperature is increased to 25.0 C, the resistance increases to 105 If the f

Question

the temperature is increased to 25.0 C, the resistance increases to 105 If the final temperatue ite 8, A resistor to be used near a steam main has a resistance of 100 at 20.0° C. When of the system is 40.0 C, what will the resistance be? 9. Germanium is a semiconductor with a resistivity of about 0.60 S2-m. A device contains a ium box with a cross section of 9 mm2 and a length of 20 cm. What is the resistance of this box across its length? 10. When a hairdryer is plugged into a 120 V power supply, it draws 1875 W of power. a) What is the current going through the hairdryer? b) What is the resistance of the hairdryer?

Explanation / Answer

10)Given,

V = 120 V ; P = 1875 W

a)We know that, Power is given by

P = V I

I = P/V = 1875/120 = 15.63 A

Hence, I = 15.63 A

b)V = IR

R = V/I = 120/15.63 = 7.68 Ohm

Hence, R = 7.68 Ohm

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