Question

A torch bulb is rated at 1.5 volt to 500 milliamperes find resistance

Answer 1

the resistance is 3 ohm
I=500 mA=0.5 A
Resistance R= V/I
R=1.5/0.5= 3 ohm

Answer 2

v = IR

v = 1.5v , I = 0.5 ampere

then R = 3 ohm