Show that the equivalent resistance of a series combination is always greater than any one of the individual resistances.

Important Questions on Electric Resistance and Ohm's Law

MEDIUM

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 1

Define drift velocity, time of relaxation and current density. Current density is a vector quantity but current has both magnitude and direction still it is considered as scalar. Why?

HARD

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 2

State Ohm’s law. Derive it on the basis of drift velocity, time of relaxation and collisions of free electrons with ions of a metallic substance.

HARD

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 3

Define electric resistance, specific resistance and specific conductance. Write the factors on which electric resistance depends.

HARD

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 4

Write vector form of Ohm' law universal? Show graphically ohmic and-ohmic nature of the conductors, giving examples of each.

HARD

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 5

Explain resistivity, show its variation with temperature for

(i) conductors (ii) semi-conductors (iii) alloys.

HARD

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 6

Define and write units of specific resistance and specific conductance. Some mass of a metal wire is drawn in two wires in such a way that second one is double in thickness. Compare the resistances.

HARD

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 1

A current of