Question

Ohm's Law is given by the equation V = IR where V is voltage in watts, I is current in amperes, and R is resistance in Ohms.

A lamp needs 0.5 amperes.

Which equation can be used to determine the voltage for a given amount of resistance?


V=0.5R

V=R0.5

V = 0.5R

V = 2R

Answer 1

You start with the equation V = IR, plug the value 0.5 for I and you have

V = 0.5*R

So, the first three options are equivalent and correct.

Answer 2

V=IR

And current, Ampere is given as 0.5 so substituting it back in the main equation gives V = 0.5R