A(n) _____ load is any load in which current increases proportionately as voltage increases and current decreases proportionately as voltage decreases.

The correct choice is linear / nonlinear. A linear load is characterized by a direct relationship between voltage and current; that is, when the voltage increases, the current increases proportionately, and when the voltage decreases, the current decreases in the same proportion. This behavior follows Ohm's Law, which states that voltage equals current multiplied by resistance (V = IR), where resistance remains constant under varying conditions.

On the other hand, nonlinear loads do not maintain this direct proportionality between current and voltage. Instead, they exhibit more complex relationships that can result in varying current levels at the same voltage. This distinction is important in understanding different types of electrical loads in various applications, particularly regarding their impact on electrical systems and how they interact with circuit elements.

Understanding the nature of linear versus nonlinear loads is crucial for designing circuits, ensuring efficient operation, and maintaining system stability.