A device which uses electrical power is also called a _____.

A device that uses electrical power is referred to as a load because it embodies the fundamental principle in electrical engineering where the load is responsible for consuming power from a circuit. The load can be anything that requires electricity to operate, such as appliances, tools, or any other equipment that converts electrical energy into another form of energy like heat, light, or mechanical work.

In contrast, the other terms provided have different meanings in the context of electrical systems. A source typically refers to a power source that generates electrical energy, such as a battery or generator. A channel could refer to pathways for electrical signals, but it does not specifically denote a device that consumes power. A transformer is a device that changes the voltage level of electrical energy but does not consume power in the same way a load does; instead, it alters the voltage and current levels that pass through it. Therefore, the term load specifically identifies devices that draw power, accurately aligning with the question.