Question

lamp has rated volt of 60 volt and resistance of 20 ohm find the series resistance required to operate the lamp from a 75 volt supply​

Answer 1

v= 60 v
r = 20 ohm
since,
v= ir
60 = i × 20
i = 3 ampere.

v = ir
75 / 3 = r
25 ohm = r

not confirmed bt tell me crrwct answer

Answer 2

I think it will help you