What is the voltage developed across a load called?

The voltage developed across a load is called a voltage drop because it represents the potential difference that occurs as electrical energy is transmitted through the load. When current flows through a resistance in a circuit, energy is lost in the form of heat, and this results in a decrease in voltage across that load compared to the input voltage. This term is commonly used in electrical engineering to describe how much voltage 'drops' as current passes through a component, such as a resistor, due to its resistance.

In contrast, other terms such as voltage level or voltage source refer to different aspects of electrical circuits. Voltage level pertains to the specific measurement of voltage at a point in the circuit, while a voltage source is a component that provides a constant voltage, such as a battery or power supply. Voltage gain, on the other hand, refers to the increase in voltage achieved through an amplifier or circuit that adds voltage rather than reducing it, which is not applicable in the context of a load.