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Conductance and Conductivity differences physics
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Difference between Conductance, Conductivity, resistance and resistivity • 2𝑛𝑑 𝑦𝑒𝑎𝑟 𝑝ℎ𝑦𝑠𝑖𝑐𝑠 𝑐𝑢𝑟𝑟𝑒𝑛𝑡 𝑎𝑛𝑑 𝑒𝑙𝑒𝑐𝑡𝑟𝑖𝑐𝑖𝑡𝑦 • Conductance • Resistance is the opposition that a substance offers to the flow of electric current • Conductance is the reciprocal of resistance of a conductor or the degree to which an object conducts electricity. • 𝑠𝑦𝑚𝑏𝑜𝑙 𝑜𝑓 𝑐𝑜𝑛𝑑𝑢𝑐𝑡𝑎𝑛𝑐𝑒 𝑖𝑠= 𝑮=𝟏/𝑹 • si unit of conductance mho is siemens denoted by 𝑆 • According to ohms law V=𝐼𝑅⇒𝑉=𝐼/𝐺=𝐺=𝐼/𝑉 • Resistance depending on dimension of the wire • 𝐺∝𝐴 • 𝐺∝1/𝐿 • 𝐺∝𝐴/𝐿=𝜎 𝐿/𝐴 sigma 𝜎=𝑐𝑜𝑛𝑑𝑢𝑐𝑡𝑖𝑣𝑖𝑡𝑦 • Conductivity • Resistivity, is a fundamental property of a material that quantifies how strongly it resists or conducts the flow of electric current. • Conductivity is the measure of the ease at which an electric charge can pass through a material. • Reciprocal of resistivity is conductivity 𝜎=1/𝜌 • 𝐺∝𝐴/𝐿=𝜎 𝐴/𝐿 • 𝜎=𝐺 𝐿/𝐴 • If 𝐴=1𝑚^2 𝑎𝑛𝑑 𝐿=1𝑚 • 𝜎=𝐺 • Different materials have • different values of conductivity • #conductance #conductivity #resistance #resistivity #currentandelectricity #physicslearning #physicslectures #2ndyearphysics
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