Current Electricity
Madhya Pradesh Board · Class 12 · Physics
All formulas from Current Electricity in Madhya Pradesh Board Class 12 Physics. Key equations, constants, and identities for board exam preparation.
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1. Electric Current
I = q/t
I(t) = lim_{Δt→0} ΔQ/Δt
2. Ohm's Law, Resistance, Resistivity, Conductivity
V = RI
R = ρl/A
j = I/A
E = jρ
j = σE
3. Microscopic Model of Current
v_d = -eEτ/m
j = (ne²/m)τE
σ = ne²τ/m
μ = |v_d|/E = eτ/m
4. Resistivity of Materials and Temperature Dependence
ρ_T = ρ_0[1 + α(T − T_0)]
α > 0 for metals
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