Current Electricity

IIT-JEE · Class 12 · Physics

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What’s covered

  • topics
    • Electric Current
      • current density
      • colour coding of resistances
    • Ohm's Law
      • statement
      • dependence of resistance on factors
      • change in resistance
    • Drift Velocity
      • relation between drift velocity and current
      • structural model
      • mobility
    • Temperature Effects
      • temperature coefficients of resistivity and resistance
      • finding coefficient of resistance
      • validity and failure of Ohm's law
    • EMF and Internal Resistance
      • electromotive force and potential difference
      • internal resistance of a cell
    • Combination of Resistances
      • resistances in series and parallel
      • voltage divider
      • current divider
      • calculation of effective resistance
      • short and open circuits
    • Symmetry Methods
      • equipotential points
      • electrical symmetry
      • method of equipotential reduction
      • shifted and path symmetry
    • Kirchhoff's Laws
      • laws for electrical networks
      • guidelines for applying
      • determination of equivalent resistance
      • balanced Wheatstone bridge
    • Combination of Cells
      • series parallel and mixed grouping
    • Superposition and Nodal Analysis
      • superposition principle
      • nodal method of circuit analysis
    • RC Circuits
      • charging and discharging of a capacitor through a resistance
      • energy dissipated
      • equivalent time constant
    • Galvanometer
      • principle and construction
    • Ammeter
      • galvanometer as an ammeter
      • shunt
    • Voltmeter
      • conversion of a galvanometer into a voltmeter
    • Potentiometer
      • construction and uses of a potentiometer
    • Meter Bridge
      • slide wire bridge construction
      • checking of connections
      • working
    • Rheostat
      • construction and use
    • Heating Effects of Current
      • cause of heating
      • heat produced by an electric current
      • electric power produced in a circuit
      • units of electric energy and electric power
    • Maximum Power Transfer
      • maximum power transfer theorem
    • Applications
      • practical applications of heating effects