# Solid State Physics | electrons | thermal conduction

1. Feb 11, 2013

### heycoa

1. The problem statement, all variables and given/known data
Explain why electrons carry a net energy but not a net current in the case of thermal conduction.

2. Relevant equations
n/a

3. The attempt at a solution
n/a

2. Feb 11, 2013

### Simon Bridge

Focus on the basics to start with:
What does "thermal conduction" mean in this case?
What would a "net current" involve?

3. Feb 11, 2013

### heycoa

I believe thermal conduction means the transition of thermal heat via the electron gas, and net current would be the obvious: dI/dt

4. Feb 11, 2013

### Simon Bridge

$dI/dt$ would be the rate of change of net current. A net current would be $I=dQ/dt$ But what does that mean in terms of the motion of electrons? Why "net" current - why not just "current"?

What does "thermal conduction" mean in terms of the motion of electrons?
Why "net" energy? Why not just say they "carry energy"?