Which component is essential for defining a complete circuit?

A complete circuit is defined as a closed loop that allows current to flow, and it requires certain key components to function properly. Each of the listed components plays a vital role in this process.

A voltage source is essential as it provides the necessary electrical energy to push the current through the circuit. Without this source, there would be no potential difference to drive the current flow.

A load is also crucial as it represents the component that utilizes the electrical energy, such as a resistor, bulb, or motor. The load converts electrical energy into another form of energy, such as light, heat, or motion, which is the purpose of the circuit.

A switch is important for controlling the flow of current. It can open or close the circuit, enabling or disabling the current flow as needed.

Since a complete circuit requires all of these components to function effectively—anchoring the connection (switch), providing energy (voltage source), and consuming energy (load)—it’s clear that the correct answer encompasses all of them. Each component works together to create a functional electrical circuit, making the comprehensive answer that includes all the components the correct choice.