Current Electricity
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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
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