Question

Which will have higher resistance 50 volt lamp bulb or 25 watt lamp bulb and how many times?

Answer 1

We know V=IR (by ohm's law)

( -1)eq...

R=V/I. =50/I

we also know tha P=VI

P=IR *I

P=I^2R

R=P/I^2=25/I^2

So, 50/I. : 25/I^2

50I/25=2I:1

so, 50volt bulb have high res. by 2I times