Which are the three parts of a basic electrical circuit?

• A. Load, Source, Switch
• B. Battery, Resistor, Capacitor
• C. Diode, Inductor, Transformer
• D. LED, Relay, Fuse

Answer: (A)

A basic electrical circuit is defined by three functional roles: a source of energy, a load that uses that energy, and a means to control the current. The combination of Load, Source, and Switch fits these roles perfectly. The source provides the voltage that drives current through the circuit. The load uses that energy to perform work, such as producing light, heat, or motion. The switch opens or closes the path, allowing you to turn the circuit on or off. A simple flashlight illustrates this clearly: the battery is the source, the bulb is the load, and the switch controls the current. Other options name specific components you might find in circuits, but they don’t express the three essential roles that define a basic circuit.