What is the purpose of a wiring diagram?

• A. To show electrical circuit connections
• B. To measure current flow
• C. To convert AC to DC
• D. To identify fuses

Answer: (A)

Wiring diagrams are used to show how electrical circuits are connected. They map the path of each wire, where components like switches, relays, connectors, and loads sit, and the color codes or pinouts you’ll use to verify or trace a circuit from the power source to its destination. This helps you diagnose faults and perform wiring work by letting you follow the circuit visually and confirm that every connection is correct. The diagram isn’t a tool for measuring current flow—that requires a meter. It also isn’t a device for converting AC to DC—that task is done by a rectifier or power supply. Fuses may be shown to indicate protection points, but the main purpose remains illustrating how the circuit is wired and connected.