Calculate Total Collisions of Free Electrons in Extension Cord

  • Thread starter Thread starter fubag
  • Start date Start date
  • Tags Tags
    Wire
AI Thread Summary
To calculate the total number of collisions of free electrons in a 3.00 m copper extension cord carrying a current of 8.0 A, the drift velocity is given as 3.3 x 10^-4 m/s. The user is attempting to relate drift velocity to the time between collisions (Tau) but is struggling to determine the electric field necessary for the calculations. The resistivity of copper and the concentration of free electrons are provided, but the user feels stuck without additional guidance. Suggestions for finding the answer or further resources are requested, highlighting the need for clarity on the electric field's role in the calculations.
fubag
Messages
105
Reaction score
0
A current of I=8.0\;\rm A is flowing in a typical extension cord of length L=3.00 m. The cord is made of copper wire with diameter d=1.5mm.

The charge of the electron is e=1.6 *10^{-19} C. The resistivity of copper is \rho=1.7 *10^{-8}\; Omega*m. The concentration of free electrons in copper is n=8.5 *10^{28}\;m^{-3}.

Find the total number of collisions ( N_c) that all free electrons in this extension cord undergo in one second.

I know Velocity(drift) = 3.3 * 10^-4 m/s.

I tried to relate the formula V_d = a*Tau, to find Tau the time between collisions...

However given the information I was stuck solving for a = eE/M_e, because I could not determine the electric field...

Can someone please assist me on what information I might be missing?
 
Physics news on Phys.org
anyone?
 
im still stuck on this question...
 
ok so since no one seems to have a clue about this problem...

any suggestions of where I may be able to find the answer?
 

Thread 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
View full post »

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »

Similar threads

Find the drift speed of electrons in a wire
Replies
2
Views
2K
Calculating Collision Frequency of Electrons in Copper Cube
Replies
2
Views
2K
How Does Current Flow Through a Copper Wire?
Replies
3
Views
11K
How Fast Do Electrons Travel in a Copper Wire?
Replies
4
Views
5K
E-Field Through Copper Wire given drift velocity
Replies
2
Views
8K
Find Electron Current Through Iron Wire
Replies
1
Views
11K
How Long Does It Take an Electron to Travel Through a Copper Wire?
Replies
1
Views
2K
Find Drift Speed of Electrons in Copper Wire | Tom
Replies
2
Views
2K
Electron's Velocity: Calculating w/ Gauss' Thm
Replies
28
Views
2K
Extension cord connected to heater - Find the power
Replies
4
Views
5K

Hot Threads

Recent Insights

Back
Top