Ampera18 PE
Active member
Hello, i cannot wrap my head around autotransformers. it's just not working. This question is giving me the most trouble.
I have a few specific questions.
1. Can anyone explain how the adding and subtracting works? As far as I can see, any of those are possible, but perhaps the least likely is B.
2. I am struggling with the power rating question below it. What is the trick?
![20201212_210023.jpg 20201212_210023.jpg](https://cdn.imagearchive.com/engineerboards/data/attachments/11/11491-4d8fc85d84c3e309c2f41a8e56702977.jpg)
![20201212_210101.jpg 20201212_210101.jpg](https://cdn.imagearchive.com/engineerboards/data/attachments/11/11492-5d3c5b6dcf45544cceb26f40ea7db5a8.jpg)
I have a few specific questions.
1. Can anyone explain how the adding and subtracting works? As far as I can see, any of those are possible, but perhaps the least likely is B.
2. I am struggling with the power rating question below it. What is the trick?
![20201212_210023.jpg 20201212_210023.jpg](https://cdn.imagearchive.com/engineerboards/data/attachments/11/11491-4d8fc85d84c3e309c2f41a8e56702977.jpg)
![20201212_210101.jpg 20201212_210101.jpg](https://cdn.imagearchive.com/engineerboards/data/attachments/11/11492-5d3c5b6dcf45544cceb26f40ea7db5a8.jpg)