Hello everyone,

In this circuit there are two points (Mutual Inductance) ...

How I know the V1 is negative or positive and the V2 is negative or positive (please explain )?




This video explain how I Know when mutual is negative or positive .... but the loop I think wrong...

thanks,

 

That video is wrong. The red dots on the transformer indicate relative voltage polarity. A positive time-varying voltage applied to the dot input on one side (designated as the primary) will generate a positive voltage at the dot output on the other side (designated as the secondary). That means the current on the input is flowing into the dot (for a positive going signal) at the primary but flowing out (not in as the video seems to state) from the secondary output to the load.

 

hi,
As Carl states the video is incorrect.
Perhaps this LTSim will show it more clearly.
E