Assuming that the current and the power in the circuit remain constant, if the resistance in a circuit is halved, the voltage across the circuit will also be halved. This is in accordance with Ohm's Law, which states that voltage is directly proportional to resistance. Mathematically, Ohm's Law can be written as V = I*R, where V represents voltage, I represents current, and R represents resistance. If the resistance is halved, then the voltage will also be halved, as long as the current remains constant.
