SPM Physics: AHA! Electrical Conductors & Resistance Wires

 

Students often confuse conductors with resistance wires. The exam wants you to state the material, property, and application clearly.

• Low resistance materials (good conductors):

  • Copper → High conductivity → Electrical wiring

  • Aluminium → Lightweight conductor → Power transmission cables

  • Tungsten → High melting point → Filament lamp

• High resistance materials (resistance wires):

  • Nichrome → High resistance + high melting point → Heating element

  • Constantan → Stable resistance → Precision resistance wire

Exam tip: Don’t just write “use nichrome.” Write the property and application: high resistance + high melting point → suitable for heating elements. That’s how you secure full marks.

AHA! Conductor or resistor, marks depend on clarity. Not by sight, but by INSIGHT!

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