HARD
12th ICSE
IMPORTANT
Earn 100

Write down a simple relationship to show the variation of resistance with temperature. Define temperature coefficient of resistance. In what way the temperature coefficient of carbon is different from that of common conductors?    

Important Questions on Electric Resistance and Ohm's Law

HARD
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 8
Explain energy transfer in electric circuits. Prove that the energy liberated from an electric circuit is given by W=V I t=I2 R t=V2t /R, where symbols have usual meanings.
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 9
What do you mean by electric power? Obtain expressions for electric power in a circuit.
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 10
What are ohmic and non-ohmic conductors, explain? Give one example of each and draw their v-I characteristics.
MEDIUM
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 11
Show that the equivalent resistance of a series combination is always greater than any one of the individual resistances.
MEDIUM
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 12
Show that the equivalent resistance of a parallel combination is less than any one of the resistances.
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.