🔍 Key Concepts

• Emergency switchboard sections and what they typically power • Differences between DC (direct current) and AC (alternating current) supplies on ships • Why alarm and control circuits often use low-voltage DC power

💭 Think About

• Which type of power supply is most reliable for small control and alarm circuits during an emergency? • Think about which bus would still allow key alarms to function safely, even if larger AC systems are affected. • Which option sounds more appropriate for continuous, low-power, safety‑critical loads rather than heavy machinery or lighting?

✅ Before You Answer

• Identify which choice represents a low-voltage DC source suitable for control and alarm circuits. • Eliminate options that normally feed large motors or heavy AC loads rather than small alarms. • Ask: In an emergency, which section is most likely designed to keep essential alarms and monitoring energized with minimal power?