Current, Resistance….Ohm’s Law Question?
The question is about the effects of changes in current and electric field on various physical parameters in a wire.
If the current in a wire is doubled, what happens to (a) the current density, (b) the conduction-electron density, (c) the mean time between collisions, and (d) the electron drift speed? Do these parameters change, and if so, by how much?
Furthermore, when the electric field in a wire is doubled, what effects are observed on (a) the current density, (b) the conduction-electron density, (c) the mean time between collisions, and (d) the electron drift speed? Again, do these parameters change, and if so, to what extent?
1 Answers
“Current, Resistance….Ohm’s Law Question?”
“The current in a wire is doubled. what happens to (a) the current density,”
doubles.
“(b) the conduction-electron density,”
Unless the wire heats significantly, it does not change.
“(c) the mean time between collisions,”
halves
“and (d) the electron drift speed?”
doubles.
“When the electric field in a wire is doubled, what happens to (a) the current density,”
No change, if that (voltage) is the only change.
“(b) the conduction-electron density,”
Doubles or halves, depending on the specific field applied.
“(c) the mean time between collisions,”
No change, unless the current changes.
“and (d) the electron drift speed?”
No change, unless the current changes.
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