A bulb has a resistance of 2Ω when cold. It takes up a current of 0.4 A from a source of 4V and then glows. Calculate the resistance of the bulb when it is glowing and elaborate on the reason for the difference in resistance?
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Answer:
MAY BE INTERNAL RESISTANCE
Explanation:
given resistance =2 ohm
V=IR
4=0.4R
R=10 ohm
internal resistance=10-2=8 ohm
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