2 electric bulbs of 50w and 100w are given. Which one will be brighter when they are connected 1) in series 2) in parallel and why?

Asked by  | 27th Jul, 2011, 05:10: PM

Expert Answer:

For a given rated voltage bulb,
The resistance of 50W rated bulb is much more than that of the 100W bulb.resistance is given by:
     R=V2/P
and the total current in the circuit in series is given by:
        I=V/Rs
where Rs=RA +RB
as same current passes through each bulb when connected in series,50W bulb will glow brighter as power , P=I2R, is more in case of 50 W bulb.
 
similarly , when the bulbs are connected in parallel, 100W bulb will be much brighter as power ,P=V2/R ,is more in case of 100 W bulb.

Answered by  | 27th Jul, 2011, 10:02: PM

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