A (100 W, 200 V) bulb is connected to a 160V power supply. The power consumption would be.

Power= 100 W, Voltage= 200 V

Resistance of bulb

$=\frac{{\mathrm{V}}^2}{\mathrm{P}}=\frac{200\times 200}{100}=400\mathrm{\Omega }$

When bulb is applied across 160 V.

Current in bulb $=\frac{160}{400}\mathrm{A}$

Power consumption $\mathrm{VI}=160\times \frac{160}{400}=64\mathrm{W}$