The unit Current Electricity has got 70 periods.
- Fundamental concepts (12 periods)
- Electric charges and electric current \[I = \frac {Q}{t} \]
- Mechanism of conduction of electricity through a metallic conductor
- Expression for the relationship between current and drift velocity
- Current density
- Potential difference
- Resistance and resistivity \[R = \frac {\rho l}{A} \]
- Variation of resistance with temperature
- Temperature coefficient of resistance
- Superconductivity
- Behavior of superconductors
- Super conducting materials
- Properties of superconductors
- Uses of superconductors
- Combination of resistors
- Series combination
- Parallel combination
- Equivalent resistance of simple networks
- Ohm's law
- Conditions for validity of Ohm's law
- I - V curves
- Ohmic conductors
- Non-ohmic conductors
- Potential divider circuit
- Energy and power (06 periods)
- Expression of energy dissipated due to flow of charges \[W = QV \] \[W = VIt \]
- Expression for power (rate of dissipation of energy) \[P = VI \]
- Obtaining formulas, \[P = I^2 R \] \[P = \frac {V^2}{R} \] \[W = I^2 R t \] \[W = \frac {V^2 t}{R} \]
- Application of the following formulas for any electrical appliance \[P = VI \] \[W = VIt \]
- Application of the following formulas for appliances producing heat only (Joules heating) \[P = I^2 R \] \[P = \frac {V^2}{R} \] \[W = I^2 R t \] \[W = \frac {V^2 t}{R} \]
- Electromotive force (12 periods)
- Formation of potential difference between plates of a simple cell
- Transformation of different forms of energy in various sources of electromotive force
- Definition of electromotive force
- Introduction of internal resistance
- Application of the law of conservation of energy to a circuit having a source of electromotive force
- The potential difference between the terminals of a cell in a closed circuit \[V = E - Ir \]
- Determination of electromotive force (e.m.f.) and internal resistance of a cell (graphical method)
- Combination of sources of electromotive force
- Series connection
- Parallel connection of identical sources
- Graphical representation of the relationship between resistance and power dissipation of a resistor
- Conduction for maximum power transfer (derivation is not necessary)
- Electric circuits (08 periods)
- Kirchhoff's laws
- First law (conservation of charges)
- Second law (conservation of energy)
- Electrical measuring instruments (12 periods)
- Ammeter, Voltmeter & Ohm-meter
- Ammeter
- Arrangement
- Properties of an ideal ammeter
- Changing the range of an ammeter
- Voltmeter
- Arrangement
- Properties of an ideal voltmeter
- Changing the range of a voltmeter
- Ohm-meter
- Wheatstone bridge and it's uses
- Wheatstone bride
- Relationship between resistances for balanced condition
- Meter bridge
- Facts to be considered in using meter bridge
- Uses of meter bridge
- Finding temperature coefficient of resistance
- Potentiometer
- Principle of potentiometer
- Calibration of potentiometer
- Facts to be considered in using potentiometer
- Uses of potentiometer
- Comparison of electromotive forces
- Comparison of resistances
- Determination of internal resistance of a cell
- Advantages and disadvantages of using potentiometer
- Electromagnetic induction (20 periods)
- Magnetic flux and flux linkage
- Laws of electromagnetic induction
- Faraday's law
- Lenz's law
- Demonstrating the laws of electromagnetic induction
- Electromotive force induced in a straight rod moving in a uniform magnetic field
- Expression for induced electromotive force
- Fleming's right hand rule
- Electromotive force induced in a rod rotating in a magnetic field
- Electromotive force inducted in a disc rotating in a magnetic field
- Electromagnetic force induced in a rectangular coil rotating in a magnetic field and expression for the maximum value
- Alternating current generator
- Arrangement
- Graphical representation of the variation of electromotive force with time
- Introduction to alternating current and voltage
- r.m.s value and peak value of current and voltage
- Average power in watts in a resistive circuits
- Eddy current and their uses
- Back e.m.f. of an electric motor
- Demonstration of back e.m.f. of electric motor
- Effect of the back e.m.f. on the armature current
- Controlling the initial current / starter switch
- Transformers
- Structure
- Relationship between the number of turns and the voltages of primary and secondary coils for ideal transformers
- Step-down and step-up transformers
- Input and output power of the transformer
- The product VI, as input / output power of a transformer
- Energy loss in a transformer
- Loss due to Joule heating
- Loss due to eddy current
- Method of minimize energy loss
- Uses of transformers
- Transmission of electric power
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