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Take two nichrome wires of equal length but different thickness. Pass current for 30 seconds in each and feel which heats more. Then repeat with two wires of the same thickness but different lengths. Write a brief report of your findings.
Show sample answer
Heat depends on the wire's thickness and length.
Good Practices
- Use the same cell and the same time for each wire.
- Touch each wire only for a moment, carefully.
- Compare the thin and thick wires first.
- Then compare the short and long wires.
- Note which wire heats up more in each case.
The wire's thickness and length change how much it heats.
