A bulb, when cold has a resistance of 1 ohm . It draws a current of 0.3 A when glowing from a source of 3 V. Determine the resistance of the bulb when glowing. Explain the reason for the difference in resistance.
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As we know that.,
V=IR
R=V/I
R=3/0.3
R=10 ohm
The reason for the increase in resistance is that the resistance is directly proportional to the temperature so on glowing the bulb there will be slightly increase in its temperature .
Thats why the resistance increased.
.....hope this will help u
V=IR
R=V/I
R=3/0.3
R=10 ohm
The reason for the increase in resistance is that the resistance is directly proportional to the temperature so on glowing the bulb there will be slightly increase in its temperature .
Thats why the resistance increased.
.....hope this will help u
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