Which of the following lists correctly identifies the four basic components of a simple electrical circuit?

• A. Resistance, Reactance, Power, and Conductors
• B. Power Source, Conductors, Loads, and Switches
• C. Power Supply, Conductors, Outputs, and Inputs
• D. Energy, Wires, Lamps, and Fuses

Answer: (C)

In a simple electrical circuit, energy must come from a source, travel along a path, be delivered to a device that uses it, and be controllable so you can start or stop the flow. That pairing of roles is captured by identifying four basic parts as a power source, conducting paths, an output (the device that consumes energy), and an input (the control that enables or disables the current). The option that lists Power Supply, Conductors, Outputs, and Inputs fits this view: the power supply provides the energy, conductors form the path, outputs represent the loads or devices using the energy, and inputs represent the control element that drives or interrupts the circuit. The other choices mix in properties or devices that aren’t fundamental building blocks of a simple circuit—resistance and reactance are circuit properties, not core components; a fuse is a protective device rather than a basic component of every simple circuit; and “loads” or “switches” are not paired as inputs/outputs in the same way as the input/output framing described here.