Question

Calculate the resistance of aluminium wire of length 60cm and cross-sectional area 1mm2. The specificresistance of aluminium is 2.6*10-8 ohm-m.

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Answer 1

Length(l)= 60 cm= 60×10⁻² m
Area (A)=1 mm² = 10⁻⁶ m²
Resistivity(ρ)= 2.6× 10⁻⁸ Ω m
Resistance(R)=?

By using the formula,R= ρl/A
                                    =(2.6× 10⁻⁸ × 60×10⁻² ) / 10⁻⁶ 
                                    =156× 10⁻⁴ Ω
                                    =1.56 × 10⁻² Ω

∴Resistance of the aluminium wire= 1.56 × 10⁻² Ω

Answer 2

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