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ELECTRICITY, If n electrons pass through the cross section of a conducor in time t, then total charge, passed through the conductor is Q = n x e., 1e = 1.6 x 10 -19C ; 1C = 6.25 × 10 1ºe, Current:Rate of flow of charge, 1C -1Cs", 1A=, 1s, • Potential at a point: Amount of work done per unit charge in bringing a postive charge, 1V= 1JC, W, from infinity to that point;, V-, Potential Difference :, W, V,-V, A, V, R, V, Ohm's Law : V = IR →R=¥, 10 =, 1V, 1A, Ohmic, Conductor, B, Resistance : Obstruction offered to the flow of current by conductor., R om, R =p Resistivity p =, Ohm's Law is NOT applicable to, a) Unilateral networks : Diodes, Transistors, b) Non- linear elements : Thyristors, Non-Ohmic, Conductor, Curent, Band Resistor, Combination of Resistances, Series, Parallel, 2, 1, 2, F tet, R., R., T, IN, L00, 1.1, R=R, +R,+ R,, IM, Heating effect of current depends on:, a) Amount of current passing, 12, b) Resistance of wire ,R, oer, Gry, Power P-, H=l'Rt, V-I-R-, Joule, watts, R, c) Time for which current flows, t, Applications, Kirchoff's 18t Law, Kirchoff's 2nd Law, 1, + 1,= 1,+ I,