ARMY PUBLIC SCHOOL, KIRKEE Subject: Physics Class: X, Session: 2011-2012 CHAPTER: ELECTRICITY APRIL 1 – MAY 7, JUNE 15 -JUNE 25, 2011, Number of periods: 20 Previous knowledge: Electric current Conductors and Insulators Key Concepts: Electric Charge: Definition and standard unit of charge Coulomb’s Law Electric Current: Definition and standard unit current. Electric potential: Definition of potential and potential difference, standard unit Electric circuits Symbols of components like battery, voltmeter, ammeter, rheostat and switch key circuit diagram use of Ammeter, voltmeter Ohm’s Law: statement of law, verification by experiment Resistance of a Conductor and factors on which it depends Resistivity Combination of Resistors – Series and Parallel derivation of equivalent resistance when a system of resistors is connected in series and parallel Heating effect of Electric Current Joules Law of Heating Electric Energy Commercial Unit of Electric Energy Practical Applications of Heating Effect of Electric Energy Learning Outcomes: The learner will be able to state the nature and types of Electric Charges identify various types of Conductors , their properties and differentiate between them verify the relation between Potential Difference, Current and Resistance and their interdependence with formulae, units etc. state Mathematical formulation of Ohm’s Law and its numerical application define resistivity and state its dependent factors derive the relation for the effective resistance of resistors in series and parallel solve numerical sums based on resistances in series and parallel Give examples for the heating effect of Electrical Current state its causes, application and understand about the working of domestic appliances derive Joules law of heating state the commercial unit of electric energy solve numerical sums based on heat, electric energy and electric power Activity: Experiment to prove the Ohm’s Law Experiment to find the equivalent resistance of resistors when joined in series and parallel Type of Evaluation: Written test MCQ based on practical Test on Circuit diagrams Class work and homework Test on numericals Sample Questions: Students will be asked to define various terms related to electricity with their units They may be asked to draw various components used in electric circuit and label them Numerical sums based on Ohm’s law and its application, resistors in series and parallel Numerical sums based on Electric energy, electric power and calculation of electric bill To explain the factors, principle of working of domestic appliances, advantages and disadvantages of certain electric set ups and give reasons for situations asked Formulation of Electric energy, electric power and calculation of electric bill Safety devices being used and their types Chapter: Magnetic Effects of Electricity July 1 to Aug 20, 2011, Number of periods: 20 Previous knowledge: Magnets Properties of bar magnet Electricity Key Concepts: Magnetic field Magnetic field lines Magnetic field due to current Magnetic field due to a current carrying straight wire and circular coil Magnetic field due to solenoid carrying current Right hand thumb rule Force on current carrying conductor placed in a magnetic field Fleming’s left hand rule Rotation of current carrying conductor in a magnetic field Electric motor Electromagnets Electromagnetic induction Induced potential difference, induced current Fleming’s right hand rule Electric generator Direct and alternating current Advantages and disadvantages of AC over DC Domestic circuit. Earthing, overloading, short circuiting Electric fuse Safety measures at home Learning Outcomes: The learner will be able to define magnetic field and field lines list the properties of magnetic field draw magnetic field lines around a bar magnet explain deflection in magnetic compass in the presence of bar magnet explain deflection in magnetic compass due to the Magnetic field created by current carrying conductor draw magnetic field lines around a current carrying straight wire and circular coil define a solenoid draw magnetic field lines due to current in a solenoid state right hand thumb rule and find direction of field explain force on a current carrying conductor in a magnetic field state Fleming’s left hand rule and explain the application in electric motor explain the principle, construction and working of electric motor with figure define electro magnets and Electromagnetic induction state Fleming’s right hand rule and explain the application in electric generator define direct and alternating current compare and contrast AC and DC explain the principle, construction and working of electric generator with figure define live wire, neutral wire, earth wire, overloading, short circuit explain the need for safety measures like the electric fuse and earth wire at home. . Activity: Trace the magnetic field lines around a bar magnet using iron filings and a magnetic compass needle Type of Evaluation: Written test diagrams Class work and home work Sample questions: 1. Define magnetic field. 2. List the properties of magnetic field 3. Draw the magnetic field lines around a current carrying circular loop 4. State Fleming’s right hand rule. 5. Explain the principle, construction and working of electric motor with figure 6. What is the function of split rings in an electric motor? 7. Explain the principle, construction and working of electric generator with figure 8. What are the functions of earth wire and fuse wire? Chapter: Sources of energy Aug 22 to September 6, 2011, Number of periods: 10 Previous knowledge: Renewable and non renewable sources of energy Key Concepts: Source of energy: Qualities of a good source of energy, disadvantages of use of fossil fuels, thermal and hydro power plants, problems associated with construction of big dams. Improvements in technology: Bio-mass, Construction and working of biogas plants, advantages of biogas, advantages and disadvantages of wind energy. Non-conventional sources of energy: Solar energy, construction and working of solar cooker, solar cells, uses of solar cells. Energy from other sources: Tidal, wave and ocean thermal energy, geothermal energy, nuclear energy. Environmental consequences of using nuclear energy, the need to look for renewable energy sources Learning Outcomes: The learner will be able to list the characteristics of a good source of energy state the disadvantages of using fossil fuels explain the conventional sources of energy and their uses explain the working of bio gas plant, solar cookers, solar water heaters, windmills state the non conventional sources of energy explain the working of ocean thermal and geo thermal plants compare and contrast the various sources of energy understand the environmental consequences of using nuclear energy explain the need to look for renewable energy sources Type of Evaluation: written test Sample questions: 1. Write any two characteristics of a good fuel. 2. What are the disadvantages of fossil fuels? 3. Discuss the advantages and disadvantages of solar cells? 4. Explain the working of bio gas plant with a diagram. 5. Compare and contrast bio gas and hydel electricity as sources of energy.
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