Final answer:
If the voltage of the power source is doubled, the current through the circuit will also double.
Step-by-step explanation:
According to Ohm's law, the current in a circuit is directly proportional to the voltage. Therefore, if the voltage of the power source is doubled, the current through the circuit will also double.
For example, let's say we have a circuit with a voltage of 10 volts and a current of 2 amps. If we double the voltage to 20 volts, the current through the circuit will double to 4 amps.
Therefore, option a. The current will get doubled is the correct answer.