# Current, Resistance….Ohm’s Law Question?

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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 they change (and by how much if they do) or remain the same?

When the electric field 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 they change (and by how much if they do) or remain the same?

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### 1 Answer

• “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.