another small problem

Thread Starter


Joined Apr 27, 2007
In Vol II, I believe there is a problem with the polarity of the ac power supplies in Figure 2.13. I am looking at the .pdf version, not sure about the others


Joined Nov 17, 2003
Hi bputter,

Can you be more specific about the problem? Link to the e-book chapter, a more detailed description of the problem and why you think it is incorrect.




Joined Jul 31, 2004
The explanation is in the equation image preceding PDF figure 2.13 which is shown here

If you are concerned about the 8 V battery polarity being reversed, the DC battery cannot have a phase angle. However, it can have the polarity revesed to account for the 180 phase of the 8V angle 180 AC source. The 8V battery polarity is reversed to repersent the AC 8V angle 180 source.

The polarity of the 2V DC meter is reversed form the 2 V angle 180 meter for the same reason.

The polarities look OK to me.