Question

an electric bulb marked 100w and 400v . during consumption the resistance of its filament would be​

Answer 1

Answer:

1.6k ohms is the resistance of the filament.

Explanation:

As we know that Power P=VI

we know P=300w and V=400v

Then I= 300/400 amps =0.75 amps and we know

V=IR then R=V/I =400/0.75 =1.6k ohms