If the resistance in a circuit is halved, what happens to the current if the voltage remains constant?

When the resistance in a circuit is halved while keeping the voltage constant, the current increases. According to Ohm’s Law, which states that current (I) is equal to voltage (V) divided by resistance (R) — represented by the formula I = V/R — changing the resistance while maintaining the same voltage will have a direct impact on the current.

If resistance is halved, the denominator in the equation becomes smaller. For instance, if the original resistance is R, changing it to R/2 means that the current I will equal V divided by R/2, which mathematically is the same as multiplying V by 2/R. As a result, the current effectively doubles when resistance is halved.

The other answers do not accurately describe the effect on current under these circumstances. Hence, when resistance is reduced to half and voltage remains constant, the current indeed doubles.