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?
In serial connection, the total current in the circuit is a constant.
Thus whichever will have a higher potential through will glow brighter.
in a serial circuit, Power is directly proportional to resistance (P=I2R)
thus 100 W will have higher resistance and since V = IR hence will glow brighter.
In a parallel connection, since both of them will have equal potential difference across 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