Standard Science Primary 4 Energy

Four rods made of different materials were coated with the same amount of wax at one end and heated at the other. The time taken for the wax to melt is shown below. Which rod is the BEST conductor of heat?

A Rod B: 45 seconds
B Rod D: 60 seconds
C Rod A: 20 seconds
D Rod C: 15 seconds
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Worked Solution

Step 1: A good conductor transfers heat faster. Step [2-9]: Faster heat transfer results in a shorter time for the wax to reach its melting point. Step [2-9]: Rod C took the shortest time.

Correct answer: Rod C: 15 seconds

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