The electrical energy necessary to power a...

Question 1 / 270705eccefa4bacbc34ba4d48435

Question 1 of 270705eccefa4bacbc34ba4d48435

The electrical energy necessary to power a sound-powered telephone's small vibrating bell is obtained from what power source?

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Question 1 of 27070

The electrical energy necessary to power a sound-powered telephone's small vibrating bell is obtained from what power source?

🔍 Key Concepts

• How sound-powered telephones work without external electrical power • Which systems on a ship rely on the ship’s main or emergency electrical distribution (switchboards, batteries) • What it means for equipment to be independent of ship’s power in an emergency

💭 Think About

• If normal and emergency power both fail, which of these options could still let the phones operate? • Do sound-powered telephones usually depend on the ship’s electrical system, or do they create their own energy in some way? • Look at the names of each choice: which ones clearly depend on the ship’s electrical network, and which one suggests a self-contained source?

✅ Before You Answer

• Identify which answers are tied to shipboard electrical systems (main or emergency) • Recall that sound-powered phones are designed to work even during total power failure • Check which option implies local, manually generated power at each station rather than centralized power

Question 1 of 27070

The electrical energy necessary to power a sound-powered telephone's small vibrating bell is obtained from what power source?

the emergency switchboard

each station's hand-cranked generator

normal 115-volt DC supplies

the emergency batteries for the general alarm

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Question 1 / 270705eccefa4bacbc34ba4d48435

Question 1 of 270705eccefa4bacbc34ba4d48435

The electrical energy necessary to power a sound-powered telephone's small vibrating bell is obtained from what power source?

Back

Question 1 of 27070

The electrical energy necessary to power a sound-powered telephone's small vibrating bell is obtained from what power source?