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Question

Four bulbs having power rating 25W,40W,60Wand 100W are connected in series and this combination is connected across the a voltage V then match the following:

Match the following:

Column -I Column - II
a. 25 W bulb (i) The highest potential difference
b.100 W bulb (ii) The second highest potentisl difference
c.60 W bulb (iii) The third highest potential difference
d.40 W bulb (iv) The lowest potential difference


A
a(iv), b(i), c(iii), d(ii)
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B
a(i), b(iv), c(iii), d(ii)
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C
a(i), b(iv), c(ii), d(iii)
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D
a(iv), b(i), c(ii), d(iii)
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Solution

The correct option is B a(i), b(iv), c(iii), d(ii)
We will find out the resistance of individual bulbs using their power rating. Resistance of a bulb is given as R=V2/P and using this formula we found out that 25W bulb has the highest resistance and when they are connected in series then the current in them will be the same.
Potential difference is given by V=I*R and so the potential difference increases when power goes down.

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