Electric Current Through Conductors — Formula Sheet
Maharashtra Board · Class 11 · Physics
7 formulas from Electric Current Through Conductors (Maharashtra Board Class 11 Physics) on one page, grouped by topic.
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Formulas and Key Relations
Electric Current and Drift Velocity
Current I = Q/t, where Q is charge and t is time
Resistivity and Temperature Dependence
Conductivity σ = 1/ρ, unit: S/m
Combination of Resistors
Series
Rs = R₁ + R₂ + R₃ + ..., equivalent resistance increases
Key relations
Electric current I is defined as the rate of flow of charge
I = q/t.
When electric field is applied, electrons drift with average velocity Vd = I/(nAe), where n is electron density per unit volume.
Resistance R = ρl/A depends on material (resistivity ρ), length l, and cross-sectional area A.
Power dissipated in resistor
P = VI = I²R = V²/R.
Full sheet with units and worked examples
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