Final answer:
To double the current, multiply the voltage by 2 with the resistance remaining constant.
Step-by-step explanation:
When considering the relationship between electrical current, resistance, and voltage, doubling the current can be achieved by multiplying the voltage by 2, with the resistance remaining constant.
This is because according to Ohm's law, current is directly proportional to voltage and inversely proportional to resistance.
Therefore, by increasing the voltage, the current will also increase.