A relay is an electric component that uses a

A relay is an electric component that uses a

• A. Large current to control a smaller current
• B. Small current to control a larger current
• C. Convert AC to DC
• D. Store energy

Answer: (B)

Relays let a small control current switch a larger current in a separate circuit. When the coil gets energized with a modest current, it creates a magnetic field that moves contacts to open or close the high‑current path. This design lets a low‑power signal control a high‑power load while keeping the two circuits electrically isolated, which is essential in automotive systems where sensitive electronics trigger heavier components like starters, solenoids, or lights. It isn’t about converting AC to DC or storing energy—that would be a rectifier and a storage device (like a capacitor or battery), respectively.

Relays let a small control current switch a larger current in a separate circuit. When the coil gets energized with a modest current, it creates a magnetic field that moves contacts to open or close the high‑current path. This design lets a low‑power signal control a high‑power load while keeping the two circuits electrically isolated, which is essential in automotive systems where sensitive electronics trigger heavier components like starters, solenoids, or lights. It isn’t about converting AC to DC or storing energy—that would be a rectifier and a storage device (like a capacitor or battery), respectively.