Internet of Things (IoT) Practice Exam 2026 – Comprehensive Prep Resource

To increase the current flowing through a resistor in a circuit, increasing the voltage applied to the resistor is the appropriate action. This relationship is described by Ohm's Law, which states that the current (I) through a resistor is directly proportional to the voltage (V) across it and inversely proportional to the resistance (R), represented by the formula I = V/R.

When you increase the voltage while keeping the resistance constant, the increased voltage leads to a higher current flowing through the resistor. This principle is fundamental in electrical engineering and circuit design, as it allows for the manipulation of current levels simply by adjusting the voltage.

The other options do not effectively increase the current under standard conditions. Decreasing the voltage would lower the current, and altering the room temperature can affect resistance but does not directly increase the voltage or current. Decreasing the resistance could also increase the current, but this requires a change in the physical component, rather than simply adjusting the voltage applied to the existing resistor.