Concepts Of Physics MCQ Edition [Volume 2]PhysicsElectric Current in Conductors
Consider a current flowing through a resistor. Let K₁ and K₂ denote the average kinetic energies of the conduction electrons and the metal ions, respectively. Which of the following is true?
Options
- AK₁ < K₂
- BK₁ = K₂
- CK₁ > K₂
- DAny of these three may occur
Correct answer
C. K₁ > K₂
Step-by-step solution
When a current flows through a resistor, the applied electric field continuously accelerates the conduction electrons, thereby increasing their kinetic energy. These energetic electrons undergo frequent collisions with the metal ions in the lattice, transferring a portion of their kinetic energy to the ions. This energy transfer is responsible for the Joule heating of the resistor. For a continuous net transfer of energy from the conduction electrons to the metal ions, the average kinetic energy of the conduction e