Current Electricity Theoretical Important Questions in Physics for Class-XII Pdf Download

Chapter 3 : Current Electricity
  • Electric Current.
  • Flow of Electric Charges in metallic Conductor.
  • Drift velocity and it’s relation with current.

  • Ohm’s Law
  • Electric Resistance.
  • Electric Energy and Power.
  • Electric Resistivity and Conductivity.

  • Carbon Resistor, Colour Code for resistors.
  • Series and parallel combination of resistors.
  • Temperature dependence of resistance.

  • Internal Resistance Of a cell.
  • Potential differences and E.M.F of a cell.
  • Combination of cell in series and parallel.
  • Kirchhoff’s Law and its simple Application.
  • Weatstone Bridge, Metre Bridge.
  • Potentiometer:-
  • Principle and it’s Application to measure Potential differences and for comparing EMF of two cells.
  • Measurements of internal Resistance Of a cell.

Current Electricity:

1. Define drift velocity and derive an expression for it.

2. Derive the expression I=nAevd

3. Deduce Ohm's law from elementary ideas and hence write an expression for resistance

and resistivity.

4. Derive an expression for conductivity in terms of mobility

5. Explain the color coding of carbon resistors.

6. Derive an expression for the current in a circuit with external resistance R when

 (a) ‘n’ identical cells of emf E and internal resistance r are connected in series

 (b) ‘m’ identical cells are connected in parallel

7. State and explain Kirchhoff’s laws.

8. State and explain the principle of Wheat Stone's principle. Deduce it using Kirchhoff’s

laws.

9. Describe how you will determine the resistance of a given wire using Meter Bridge.

10. Explain the principle of a potentiometer. Describe how will you determine

(a) The ratio of emfs of two primary cells using potentiometer.

(b) The internal resistance of a primary cell using potentiometer.

11. Explain the variation of resistance and resistivity with temperature and hence define

temperature coefficient of resistance and resistivity. 


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