Current Electricity
December 8, 2016
Categorised in: 12th Physics
(1) Kirchoff’s Law: (i) ΣI = 0 (ii) ΣIR + ΣE = 0
(2) Wheatstone’s network: Balanced condition,
${R_1}/{R_2} = {R_3}/{R_4}$
(3) $R = ρ l/A$
(4) Meter Bridge:
(i) $X/R = l_x/l_R$
(ii) Kelvin’s Method, ${G}/{R} = l_G/l_R$
(5) Potential Gradient: $V/L = k$
(6) I (r+R) = E
(7) $σ = R/L$
(8) E = k l
(9) $E_1/E_2 = {l_1 + l_2}/{l_1 – l_2}$
(10) $r = R({l_1 – l_2}/{l_2})$ r -> internal resistance of cell
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