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# PH 223 30:1-3

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## Richard Datwyler

on 14 November 2016

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#### Transcript of PH 223 30:1-3

Electrons flow through a 1.6 mm diameter aluminum wire at 2.0 X 10^-4 m/s. How many electrons move through a cross section of the wire each day? (n= 6 x 10^28)
A 2.0 x 10 V/m electric field creates a 3.5 x 10 electron/s current in a 1.0 mm diameter aluminum wire. What are the drift speed and the mean time between collisions for electrons in this wire? (n = 6 x 10 )
An aluminum wire consists of the three segments shown here. The current in the top segment is 10 A. for each of these three segments find the, Current, Current density, Drift velocity, Electron current. (n = 6 x 10 )
2mm
1mm
2 mm
10 A
"When too thin a wire is connected to a motor, it will burn up. Is this because the motor is trying to pull out electrons faster than the wire is able to? Or is the source trying to push to many electrons through the wire?"
If it takes 2 seconds to fully charge a capacitor to 250 mC, using a silver wire with a radius of 0.5 mm. What is the drift speed? (n = 5.8 X 10 )
28
17
28
-3
28
"What is the difference between current and drift speed?"
"Im trying to understand current density. Current is charge per second so current density would be charge per second over distance squared. Is this comparable to a volume flow rate or mass flow rate?

How would you get current to flow opposite the natural direction like when charging a battery?

Could you describe something negatively charged as saturated with electrons?"
"So when a current goes through a wire when it is pushed by an electric field, and it creates a magnetic field as well right? How does it create a magnetic field?"
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