🔍 Key Concepts

• Electrical conductivity of metals commonly used aboard ships (wiring, bus bars, structure) • General rule: good conductors vs poorer conductors (think about what is used for power cables vs hulls vs ballast/weights) • Knowing that silver, copper, and aluminum are all used as conductors, but not equally well

💭 Think About

• Which metal is known as the best common electrical conductor used as a standard in textbooks? • Between copper and aluminum, which one is usually preferred for smaller high‑quality electrical wires aboard vessels? • Are iron and lead generally used for carrying current, or more for structure/weight/shielding? How would that affect where they belong in the list?

✅ Before You Answer

• Make sure the order goes from best conductor to worst conductor (highest conductivity to lowest). • Check that silver and copper are near the top of the list and lead is near the bottom. • Verify that no metal appears twice in the same list and that all five materials in the option look reasonable in order.