You did note the mention of a switch didn't you.

Each time the switch is closed a surge will rush through the primary coil
creating a rising magnetic field which will be inductively coupled to the
secondary until the flow overcomes the reactance of the inductor (primary
coil in this case).  And a second pulse will occur as the magnetic field
collapses when the switch is opened.

This is a common way to investigate inductors, coils, transformers; a sort
of slow, hand controlled, half wave, AC.

Bye.

-----Original Message-----
From: MAHMOUD DARWEESH [mailto:mdarweesh@HOTMAIL.COM]
Sent: Wednesday, 18 July 2001 17:19
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE]:DOUBLE COIL



Execuse me Mr Chris,

When we put DC voltage in the primary winding, then there is no induced
voltage in the secondary? is that right.



>From: Chris Carr
>Reply-To: pic microcontroller discussion list
>To: PICLIST@MITVMA.MIT.EDU
>Subject: Re: [EE]:DOUBLE COIL
>Date: Mon, 16 Jul 2001 09:02:21 +0100
>
>Mahmoud Darweesh Wrote
>
>If I wound two coils on the same core and the direction of winding is the
>same for the two coils(say,clockwise), and connect an a.c voltage source
two
>one of the coils (name it primary). What will be the phase of the induced
>voltage on the other coil (the secondary)? Will be in-phase with the
primary
>voltage or out-of-phase with it?
>Thanx for help
>
>The simplest way of finding this out is to experiment with some lengths of
>insulated wire and a piece of iron or steel to wind the wire on (a large
>bolt).
>
>Put a voltmeter on the secondary winding and use a battery with a switch to

>power the primary winding.
>
>Regards
>
>Chris Carr
>
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