Two electric bulbs P and Q have their resistances in the ratio of 1: 2.
They are connected in series across a battery. Find the ratio of the power
dissipation in these bulbs.
Let ,
The resistance of Blub P = Rp
The resistance of Blub Q = Rq
Power dissipation of Blub P = Pp
Power dissipation of Blub Q = Pq
Given that the Ratio of resistance is
we know that,
Power
When Resistance are connected in series the current through resistance are the same.
Therefore, the ratio of the power dissipation in the bulbs is
Therefore the ratio of power dissipations of both P and Q is 1 : 2