Question

Question: A torch bulb has a resistance of 1 Ω when cold. It draws a current of 0.2 A from a source of 2 V and glows. Calculate
(i) the resistance of the bulb when glowing and
(ii) explain the reason for the difference in resistance.

Answer 1

(i)resistance when glowing-----
$r = \frac{v}{i} = \frac{2}{0.2} = 10$
10 ohm

(ii)because when the bulb glows the temperature increases and temperature increases means resistance increases as resistance is directly propotional to temperature

Answer 2

the difference in resistance occured due to an increase in temperature. Because temperature affects resistance proportionaly, that's why when the temperature risen the resistance also risen.
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