What must happen if the voltage decreases in a circuit?

When the voltage decreases in a circuit, the relationship between voltage, current (amperage), and resistance can be understood through Ohm's Law, which states that Voltage (V) = Current (I) x Resistance (R).

If the voltage in a circuit drops and we assume that the resistance remains constant, the current must also decrease since the amount of voltage drives the flow of current. However, if we want the current to remain the same despite a decrease in voltage, then the resistance must increase to compensate for the lower voltage. This adjustment helps maintain the same current flow as the original circuit.

In real-world applications, maintaining a consistent amperage can be critical for the functionality of devices and systems, which often leads technicians to adjust resistance in response to changes in voltage. Thus, when voltage decreases, to keep the system balanced, the resistance must increase in order to support stable current operation, which validates the correctness of this answer.