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Activity 11.3 — Resistance and Resistivity
NCERT Activity 11.3: Investigate how length, thickness, and material of a wire affect its resistance. Discover the relationship R = ρL/A.
How To Perform
1
Vary Length
Test wires of different lengths — observe how resistance changes.
2
Vary Thickness
Test wires of different cross-sectional areas — observe the effect.
3
Vary Material
Test copper, iron, and nichrome wires — compare resistances.
4
Summarize
Combine all observations into R = ρL/A.
⚠️ Safety Notes
- •Let wires cool between tests — nichrome heats up quickly.
- •Use the same battery voltage for all comparisons.