Question

The instant at which a bulb is switched on, it's power is maximum,then it decreases to a steady value .Explain

Answer 1

Answer: Inductor in the bulb.

The bulb has filament that is a coil of tungsten wire. It glows as it heats up.  Power is given as: $P = VI$

So, the voltage and current drawn initially is large and as it heats up its resistance increases and current decreases as voltage is constant. SO, power is maximum initially.

Answer 2

Answer:

EXPLANATION

Explanation:

The bulb has filament that is a coil of tungsten wire. It glows as it heats up.  Power is given as: P=VI

So, the voltage and current drawn initially is large and as it heats up its resistance increases and current decreases as voltage is constant. SO, power is maximum initially