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Monday, November 14, 2011

which bulb will glow bright and why?


Two bulbs of 100w and 40w respectively connected in series across a 230v supply which bulb will glow bright and why?
Answer:Since two bulbs are in series they will get equal amount of  electrical current but as the supply voltage is constant across the bulb(P=V^2/R).So the resistance of 40W bulb is greater and voltage across 40W is more (V=IR) so 40W bulb will glow brighter.

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