🔍 Key Concepts

• Micrometer as a precision mechanical measuring tool • Difference between measuring time, electrical quantities, and physical dimensions • Common tools used by machinists and marine engineers

💭 Think About

• Think about where you have seen a micrometer used: in a machine shop, an electrical lab, or a timing device? • Which of these choices involves measuring the physical size of something, rather than time or electricity? • On a ship, which department (deck, engine, or electrical) is most likely to use a micrometer, and for what purpose?

✅ Before You Answer

• Be sure you know that a micrometer is a mechanical precision gauge, not an electronic device • Eliminate any options that clearly involve electrical measurements • Ask yourself which choice would normally be checked with a caliper or micrometer in a workshop