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Unit 2 Current Electricity

The document outlines key concepts in current electricity, including Ohm's law, Kirchhoff's rules, Joule's law, and definitions related to electric current, resistance, and resistivity. It also discusses various electrical components such as resistors, thermistors, and superconductors, as well as principles like the potentiometer and thermoelectric effects. Additionally, it includes questions and explanations related to the advantages and disadvantages of series and parallel connections of cells.

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28 views1 page

Unit 2 Current Electricity

The document outlines key concepts in current electricity, including Ohm's law, Kirchhoff's rules, Joule's law, and definitions related to electric current, resistance, and resistivity. It also discusses various electrical components such as resistors, thermistors, and superconductors, as well as principles like the potentiometer and thermoelectric effects. Additionally, it includes questions and explanations related to the advantages and disadvantages of series and parallel connections of cells.

Uploaded by

K R OFFSET PRINTERS
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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2.

CURRENT ELECTRICITY

2 MARKS
1. State microscopic form of ohm’s law.
2. State macroscopic form of ohm’s law.
3. State Kirchoff’s first rule or current rule or junction rule.
4. State Kirchoff’s second rule or voltage rule or loop rule.
5. State Joule’s law of heating.
6. Define electric current.
7. Define mobility. Write its unit
8. Define current density. Write its unit.
9. Define resistance of the conductor.
10. Define electrical resistivity of a conductor.
11. Define temperature dependence of resistance or temperature coefficient of resistance.
12. What is drift velocity?
13. What are ohmic and nonohmic devices?
14. Repairing the electrical connection with the wet skin is always dangerous. Give reason.
15. What is equivalent resistance of resistors in series?
16. What is equivalent resistance of resistors in parallel?
17. What are carbon resistors?
18. What are thermistors?
19. What is critical or transition temperature?
20. What are superconductors?
21. What is electric power and electric energy?
22. What is internal resistance of a cell?
23. Why the car engines light get dimmed when it is started with switch on position?
24. Write the principle of potentiometer.
25. What is joule’s heating effect?
26. What is thermoelectric effect?
27. What is seebeck effect?
28. What is peltier effect?
29. What is Thomson effect?
3 MARKS
1. Derive the relation between current and drift velocity.
2. The series connection of cells is advantageous or disadvantageous. Explain.
3. The parallel connection of cells is advantageous or disadvantageous. Explain.
4. Explain the principle of potentiometer.
5. Explain Thomson effect.
5 MARKS
1. Describe the microscopic model of current and obtain the general form of ohm’s law.
2. Obtain the macroscopic form of ohm’s law from its microscopic form and discuss its limitation.
3. Explain the equivalent resistance of resistors in series and parallel.
4. Explain the determination of internal resistance of a cell using voltmeter.
5. Obtain the condition for bridge balance in Wheatstone’s bridge.
6. Explain the determination of unknown resistance using metre bridge.
7. Explain the comparison of emf of two cells using potentiometer.

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