Compute the resistance in ohms of a lead block 15 cm long and 0.10 cm2 in cross-sectional area. (ρ = 2.2 x 10-5 ohm-cm)

Resistance of a wire is defined as the measure of how difficult an electric current will pass through a conductor. The longer the wire, the greater the resistance. Resistivity, on the other hand, is an intrinsic property depending on the material to which the current passes. The formula for resistance in terms of resistivity is:

R = pL/A 

where:
R = resistance
p = resistivity
L = length
A = cross-sectional area

This gives a resistance of 3.3x10^-3 ohms

Wooden , walls ,doors ,support

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