According to Ohm’s Law (I = V/R), where I is current, V is voltage, and R is resistance, if the resistance of a resistor is doubled while keeping the voltage constant, the current will be halved. This is due to the inverse relationship between resistance and current. When resistance increases, the flow of electrons is impeded, resulting in a decrease in current. Conversely, if the resistance decreases, the current increases. Therefore, doubling the resistance in a circuit leads to a reduction in current flow, illustrating the direct proportionality between resistance and the opposition to the flow of electric current.