Question

if the resistance of a circuit having 12 volt source is increased by 4 ohm the current drops by 0.5 amperes what is the original resistance of circuit​

Answer 1

Answer:Start with ohms law, I = V/R. You know V so you are only left 2 unknowns but are given more information. That information in equation form is (I -0.5) = 12/(R+4). The original equation with the 12v put into it is I = 12/R. You now have 2 equations and 2 unknowns so therefore it can be solved. I think you are going to end up with a quadratic and likely one of the two roots will be negative and thus not make sense.