Which component is essential for completing an electrical circuit?

An electrical circuit requires a source of electrical energy to function, which is typically provided by a battery. The battery serves as the power source that allows current to flow through the circuit. It generates a difference in electric potential, enabling electrons to move through conductors and power devices within the circuit, such as lights or motors. While conductors, insulators, and resistors play important roles in circuit design and function, the battery is essential for initiating and maintaining the flow of electrical current. Without it, there would be no energy source to sustain the circuit operation.