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two electric bulbs of 60w and 100w are given.which one will be brighter when they are connected, 1.In series 2.In parallel and why?

Asked by anas 29th July 2012, 4:27 PM
Answered by Expert
In serial connection, the total current in the circuit is  a constant.
Thus which ever will have a higher potential through will glow brighter.
in serial circuit, Power is direcly proportional to resistance (P=I2R)
thus 100 W will have higher resistance and since V = IR hence will glow brighter.
In parallel  connection, since both of them will have equal potential difference accross them, power will be inversely proportional to resistance as P = V2/R, thus 60 W will have higher resistance. At equal potential the one with more current flowing through it will glow brighter, thus the one with lower resistance i.e 100 W will glow brighter
Answered by Expert 29th July 2012, 4:43 PM
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