In which application would you most likely find a rheostat?

A rheostat is a type of variable resistor specifically designed to control current flow and can handle high power ratings. It works by changing the resistance in a circuit, which in turn adjusts the current and voltage levels. This characteristic makes it particularly useful in applications requiring fine control over electrical output.

In light dimming applications, rheostats are commonly used to adjust the brightness of incandescent lamps by altering the amount of current that passes through the bulb. By increasing resistance, the rheostat decreases the current, leading to a dimmer light output. This is precisely why light dimming is the correct context for the use of rheostats.

Other applications like power supply regulation and signal amplification might make use of resistors, but they typically employ more complex electronic components like transistors and operational amplifiers rather than simple variable resistors. Data storage systems also do not utilize rheostats as their operation relies on digital and memory storage technologies rather than direct current control.