Which part of an electrical circuit uses the electrical energy from the power source?

The load in an electrical circuit is the component that consumes electrical energy, converting it into another form of energy, such as heat, light, or mechanical energy. This is the primary purpose of the load: to utilize the electrical energy provided by the power source to perform work. For instance, in a simple circuit, a light bulb acts as the load by converting electrical energy into light and heat.

In contrast, the conductor is responsible for carrying the electrical energy from the power source to the load, while the switch is used to control the flow of electricity in the circuit, allowing the circuit to be opened or closed. The power source is the origin of the electrical energy but does not consume it; it simply provides it. Thus, the load is essential as it signifies where the electrical energy is actively used in the circuit.