Inductive Kickback

[synchro1]

Hi guys

When the switch opens, inductor will try to keep its magnetic field alive, and to retain its magnetic poles at the same place as when the switch is closed. There is no other way for this to happen than the current to keep going on same direction as before. This is simple physics. What path it will take depends on the circuitry. In this example bemf  just can not return to the negative of the battery because the circuit is open!!! It will go through diode because the circuit closes through the capacitor back to the base of the inductor.
Sometimes our minds get stack in simple matters. It happens to all of us.

@Jeg,

There's no longer any current flowing after the Reed switch is open. You maintain that the magnetic field is sustained by some imaginary current!

[citfta]

A link to get you started:  https://en.wikipedia.org/wiki/Inductor


I had to leave for a while but now I am back.

To answer the question about current flow and opposite polarity,  answer my question about which direction does current flow inside a battery.  Does it flow from positive to negative or the other way round?  And which way does it flow outside the battery?  When you get the answer to that you will understand why polarity can switch on an inductor but the current still flows the same way.

Also do you have a way to conduct the test with a 2 channel scope?

Carroll

[tinman]

A link to get you started:  https://en.wikipedia.org/wiki/Inductor


I had to leave for a while but now I am back.

To answer the question about current flow and opposite polarity,  answer my question about which direction does current flow inside a battery.  Does it flow from positive to negative or the other way round?  And which way does it flow outside the battery?  When you get the answer to that you will understand why polarity can switch on an inductor but the current still flows the same way.

Also do you have a way to conduct the test with a 2 channel scope?

Carroll

Yes i do,and will be doing that tomorrow by way of video-as it is late at night here in OZ ATM.

[tinman]

@Jeg,

There's no longer any current flowing after the Reed switch is open. You maintain that the magnetic field is sustained by some imaginary current!

When the switch opens,the current continues to flow through the inductor--this is the flyback current we are talking about.
What do you think flyback is Synchro?-->it is the power produced by the collapsing magnetic field around the inductor when the switch is opened. It is how i have drawn it a few post back.
Current continues to flow through the inductor after the switch is open. The magnetic field is sustained some what due to the current loop through the inductor and LED.

[Jeg]

Synchro,
The current that flows when the switch is open is not from the battery. Isn't an inductor an energy tank? How that energy manifests itself during a field collapsing?