Describe what a voltage divider is.

A voltage divider is a fundamental electrical circuit that produces an output voltage that is a fraction of its input voltage. This is achieved by using two resistors arranged in series. When a voltage is applied across this series combination, the output voltage can be taken from the junction between the resistors, leading to a voltage that is proportionate to their resistance values. The principle behind this is based on Ohm's Law, where the voltage drop across a resistor is proportional to its resistance.

This functionality allows voltage dividers to be used in various applications, such as scaling down voltages for sensors, adjusting levels for analog-to-digital converters, or setting reference voltages in circuits. Unlike other options, a voltage divider does not inherently regulate output for different components, increase voltage levels, or function as a transformer — each of those has distinct roles and operational principles in electronics.