I started reading "Practical Electronics for Inventors" and had some questions pop up. I checked the errata first because I got all of the other sample questions correct in determining the voltages between different points. Applying the same logic did not yield the same result as the book showed so I wondered what was different about this model and why I got it wrong or did I?
In this example, the book lists volts between points A and D as -21V.
I had two thoughts:
1. Since the all grounds are tied together: the 9V is technically connected in series with the 12v, shouldn't this yield a positive 21V when measured between points A and D?
2. The batteries are not really connected in series, but they both have a connection to ground so its more like a reference point. Point A would be positive 12v and point D would be -9v, so a net of +3V
I am not in a class, just trying to self teach myself as much as I can, thanks for any assistance!
In this example, the book lists volts between points A and D as -21V.
I had two thoughts:
1. Since the all grounds are tied together: the 9V is technically connected in series with the 12v, shouldn't this yield a positive 21V when measured between points A and D?
2. The batteries are not really connected in series, but they both have a connection to ground so its more like a reference point. Point A would be positive 12v and point D would be -9v, so a net of +3V
I am not in a class, just trying to self teach myself as much as I can, thanks for any assistance!