Q. 63.7( 30 Votes )

# Two bulbs are rat

Answer :

Concepts/Formulas Used:

Resistors in Series: Power dissipated by a resistor:

The power dissipated by a resistor of resistance R with potential difference V across it and current I passing through it is given by: Ohm’s law:

Potential Difference (V) across a resistor of resistance R when current I passes through it is given by Ohm’s law: Let us find the resistance of the two bulbs.

We know that, Hence,  (i)

In series, the net resistance is:  The current in the circuit is   The power dissipated in the first bulb:  The power dissipated in the first bulb:  (ii)

In parallel, the potential through both is V. Hence the power is the same as the rated power i.e. P1 and P2.

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