VERY SHORT AND SHORT ANSWER QUESTIONS

1. Define electric current.
2. Write SI unit of current and define it.
3. Is electric current a scalar or vector?
4. State Ohm's law.
5. Define resistance.
6. What are the factors on which the resistance of a conductor depends?
7. What is the SI unit of resistance? Define it.
8. What is the order of electron density in metals?
9. What is the difference in the carriers of electric current in a metallic rod and an electrolytic cell?
10. Define drift velocity of electrons in a conductor.
11. What are the factors affecting the drift velocity of electrons?
12. Define relaxation time.
13. Define mean free path of electrons in a metallic conductor.
14. Define electrical resistivity of a conductor.
15. Name the two physical factors affecting electricla resistivity.
16. Define conductance of a material. Write its unit.