Two electric bulbs are connected one by one across potential difference V. At that time, power consumed in them are P 1 and P 2 respectively. Now, if potential difference V is applied across series combination of these bulbs, what will be total power consumed?
Text Solution
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Let R 1 and R 2 be the resistances of the bulbs.
Power consumed, 
So, the power consumed by the first bulb is
…(i)
and power consumed by the second bulb is
…(ii)
If these two bulbs are combined in series. So, the total resistance of the combination is
Hence, the power consumed in combination is
…(iii)
Now, from Eqs. (i) and (ii)
Form Eq. (iii),
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