How Does Time Affect Current Flow?

Click For Summary

Discussion Overview

The discussion revolves around the relationship between time and current flow in electrical circuits, specifically focusing on the effects of current and resistance on heat production in a wire. Participants explore concepts related to Ohm's law and energy dissipation.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant inquires about the role of time in current flow, specifically asking about a scenario with 0.5A current in a 5-ohm wire.
  • Another participant requests clarification on the initial question, indicating potential confusion.
  • Several participants assert that heat is produced in the wire, referencing the equation H=I^2*R*t to describe the relationship between current, resistance, and heat energy generated over time.
  • There is mention of power dissipation in watts as a consequence of the current flow, linked to Ohm's law.
  • A participant suggests that the inquiry may also relate to calculating the number of electrons flowing past a point in the wire, given the current, and provides the charge of an electron as a reference.

Areas of Agreement / Disagreement

Participants generally agree on the concept that heat is produced due to current flow and that this can be quantified using the equation provided. However, there is uncertainty regarding the initial question's intent, and no consensus is reached on the broader implications of time in current flow.

Contextual Notes

There are limitations in the discussion, particularly regarding the assumptions made about the initial question and the definitions of terms like "current flow" and "time." The mathematical steps involved in calculating heat and electron flow are not fully resolved.

falcon102
Messages
7
Reaction score
0
Hi,
I want to ask a qusetion about the electrons, what the time plays with the current flow? what will be happen for example with current 0.5A in the wire with 5 ohm?

thx
 
Engineering news on Phys.org
What do you mean? Please rephrase your question.
 
simple.
Heat will be produced, as
H=I*I*R*t
clear?
 
You get power dissipation measured in watts. Ohm's law
 
simple.
Heat will be produced, as
H=I*I*R*t
clear?

could u explain more
 
falcon102 said:
simple.
Heat will be produced, as
H=I*I*R*t
clear?

could u explain more
That equation is meant to show that the heat energy H generated by the current flow is equal to the power P multiplied by time t. Like this:

[tex]H = Power * t = I^2 * R * t[/tex]

Where I is the current and R is the resistance.

But I'm not sure that's what you are trying to ask. You might also be asking how to calculate how many electrons are flowing past a point in the wire, given the current I = 0.5A. If that is your question, you can figure it out from the fact that 1 Amp of current is equal to 1 Coulomb of charge flowing past a point per second. The charge per electron is often written as "e" with the following value:

[tex]e = -1.602 * 10^{-19} Coulombs[/tex]
 

Similar threads

What explains the current flow in a LC circuit?
  • · Replies 4 ·
Replies
4
Views
3K
Electron Current/movement in P-N junction under forward bias
  • · Replies 3 ·
Replies
3
Views
2K
Wheatstone bridge and conditions for current to flow between 2 points
  • · Replies 8 ·
Replies
8
Views
4K
Earth grounded, where does the current flow?
  • · Replies 19 ·
Replies
19
Views
6K
How much current in this wire to reach observed temperature?
  • · Replies 29 ·
Replies
29
Views
3K
Analyzing pushbutton switch ADC circuit edge cases
  • · Replies 4 ·
Replies
4
Views
2K
Why and by how much does unbalanced current flow increase EM radation?
  • · Replies 9 ·
Replies
9
Views
2K
Current through Flat Sheet or plate
  • · Replies 14 ·
Replies
14
Views
4K
I have a question about diodes and the PN junction
  • · Replies 2 ·
Replies
2
Views
2K
AC generator, current and ground
  • · Replies 26 ·
Replies
26
Views
3K