A small bulb has a resistance of 2Ω when cold. It takes up a current of 0.4 A from a source of 4V and then starts glowing. Calculate (i) the resistance of the bulb when it is glowing and (ii) Elaborate on the reason for the difference in resistance?
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Its resistance when glowing will be 10Ω
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Answer:
r = v/i
4/0.4
4×10/0.4×10
40/4
=10 ohm.
hope this ans hepls...
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