What is a pilot light and what is its typical use in control circuits?

• A. It stores electrical energy for later use.
• B. It provides a visual indication that a circuit or device is energized or in a particular state.
• C. It amplifies a control signal for a motor.
• D. It measures current in a circuit.

Answer: (B)

A pilot light is a small lamp used as a status indicator in electrical control circuits. It lights up when the circuit or a specific device (like a relay coil or contactor) is energized, giving a quick visual cue that power is present or a particular state has been reached. This helps technicians and operators verify operation at a glance without measuring with a meter. It’s not for storing energy, increasing signal strength, or measuring current—the purpose is simply to provide a visual indication of status. Pilot lights are chosen and wired to match the control circuit’s voltage and include proper current-limiting components so they don’t affect the controlling devices.