Re: [Phys-l] induced emf and induced current

[Chuck Britton <cvbritton@embarqmail.com>]

In the secondary of a transformer, the current and voltage can be totally IN phase or totally OUT of phase or anything in between.
i.e same 'direction' or opposite 'direction' as extremes for the phase relation.


----- Original Message -----
From: carmelo@pacific.net.sg
To: phys-l@carnot.physics.buffalo.edu
Sent: Fri, 9 Oct 2009 06:12:19 -0400 (EDT)
Subject: Re: [Phys-l] induced emf and induced current

Hi Bob,

In AP Physics's objectives, for example, the students need to  
calculate the magnitude and direction of the induced emf and current  
in a loop of wire or a conducting bar. Although the current is usually  
considered a scalar, eddy current (or Foucault current) can be  
clockwise or anticlockwise which is circular in nature. There could be  
alternative conception such as induced emf is in the same direction as  
current for eddy current?

On a side note, for Faraday's disc or homopolar generator, the induced  
emf could be considered as towards the centre, and similarly for the  
induced current? Or some may think that the induced current spiral  
into the centre? Some may also teach that induced emf may not  
necessarily have induced current depending on the resistance of the  
"circuit". There could be many alternative conceptions? Just curious...


Alphonsus

Quoting "LaMontagne, Bob" <RLAMONT@providence.edu>:

> Do you mean induced field? EMF is a scalar.
>
> Bob at PC
>
> -----Original Message-----
> From: phys-l-bounces@carnot.physics.buffalo.edu   
> [mailto:phys-l-bounces@carnot.physics.buffalo.edu] On Behalf Of   
> carmelo@pacific.net.sg
> Sent: Tuesday, October 06, 2009 11:42 PM
> To: phys-l@carnot.physics.buffalo.edu
> Subject: [Phys-l] induced emf and induced current
>
> Hi everyone,
>
> Does induced emf *always* have the same direction as the induced current?
>
>
> Best regards,
> Alphonsus
>
> _______________________________________________
> Forum for Physics Educators
> Phys-l@carnot.physics.buffalo.edu
> https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l
> _______________________________________________
> Forum for Physics Educators
> Phys-l@carnot.physics.buffalo.edu
> https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l



_______________________________________________
Forum for Physics Educators
Phys-l@carnot.physics.buffalo.edu
https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l