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FORMULA BOOKLET PHYSICS CLASS 12 CHAPTER CURRENT ELECTRICITY

The current is the same for all non-uniform cross-section conductor sections. Similar to water flow, charging flows faster when the conductor is small in the opposite direction and slows down when the conductor is more extensive in the cross-section so that the charging level remains unchanged.

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FORMULA BOOKLET PHYSICS CLASS 12 CHAPTER CURRENT ELECTRICITY

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  1. FORMULA BOOKLET PHYSICS CLASS 12 CHAPTER CURRENT ELECTRICITY Physics Formulas Current Electricity Formulas Are Listed Below The rate of charging flow in any part of the wire is called the electric current flowing through it. Electric current (I) = q / t. Its SI unit is ampere (A). Conventional electrical current direction is the direction of the positive charge motion. The current is the same for all non-uniform cross-section conductor sections. Similar to water flow, charging flows faster when the conductor is small in the opposite direction and slows down when the conductor is more extensive in the cross-section so that the charging level remains unchanged. When charging, q revolves around a circle with frequency f, equal power, i = qf (Metallic conductor current flows due to free electrons' motion while electrolytes and ionized gases flow now due to electrons and directions.)

  2. Types of Electric Current According to both magnitude and direction electric current is of two types 1. Direct Current (DC) Its magnitude and direction do not change over time. A ceil, battery, or DC dynamo are the most direct current sources. 2. Alternating Current (AC) An electric current whose magnitude changes continuously and changes its direction from time to time is called an alternating current. The AC dynamo is a current exchange source. ● Resistance R= V/i Where I = Strength of current i = current ● Variati on of resistance with temperature: R = R0(1 + αΔT) Where-Rt-resistance at temperature t°C, R0-resistance at temperature 0°C, α -temperature coefficient of resistance. Conductivity = Reciprocal of resistivity or σ = 1/ρ = 1/RA ● Terminal voltage Case-1: When the battery is delivering current V = E – ir Where – V-terminal P.D., E – emf of the cell, r-internal resistance of the cell, R- external resistance. Case-2: When the battery is charging V = E + ir ● Kirchh off’s laws: 1. Kirchhoff’s first law : ∑i = 0 at any junction 2. Kirchhoff’s second law : ∑i R = 0 in a closed circuit.

  3. ● The balancing condition for wheat stone bridge is p/q = r/s , Where P, Q, R and S are the resistances in the bridge ● Meter bridge Where – x – unknown resistance of the given wire, R – resistance in the resistance box, l1- balancing length from the left end of the bridge to Jockey. ρ=Lπr2X Where - ρ-resistivity of the wire, x-resistance of wire, A – Area of a cross-section of the wire, l-length of the wire. ● Potential Meter Emf of the cell in the secondary circuit Es = Iρ (i) Comparison of emf’s of two cells E1/E2 = L1/L2 Where – E1- emf of the first cell, E2 – emf of the second cell, l1 and l2-the balancing lengths of individual cells respectively. (ii) For determination of internal resistance of the cell r = R (L1 - L2)/L2

  4. Do follow NCERT Solutions for class 12 Physics prepared by Physics Wallah. If any students need to take the online test to check their concepts or understanding then they can visit Quiz for Current Electricity. Download The Pdf Of Class 12 Formula Booklet Physics Of Chapter Current Electricity

  5. Original source:https://www.pw.live/physics-formula/class-12-current-electricity-formulas

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