A torch bulb, when cold has 1 ohm resistance.It draws a current of 0.3 A from a sorce of 3 V. Calculate the Resistance of the Bulb when glowing and explain the reason for difference in resistance

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Solution

Initial resistance = 1 ohm
When the bulb is on
Given
I = 0.3A
V = 3 V
R = V/I = 3/0.3 = 10 ohm
The resistance is higher when the bulb is glowing because the resistance increases with the increase in temperature.

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A torch bulb, when cold has 1 ohm resistance.It draws a current of 0.3 A from a sorce of 3 V. Calculate the Resistance of the Bulb when glowing and explain the reason for difference in resistance

Initial resistance = 1 ohm When the bulb is on Given I = 0.3A V = 3 V R = V/I = 3/0.3 = 10 ohm The resistance is higher when the bulb is glowing because the resistance increases with the increase in temperature.

Initial resistance = 1 ohm
When the bulb is on
Given
I = 0.3A
V = 3 V
R = V/I = 3/0.3 = 10 ohm
The resistance is higher when the bulb is glowing because the resistance increases with the increase in temperature.