The free chapters have very little information. Assuming the chapters they want you to pay $0.99 [each] for are similar, you could get about the same amount of information in a few Wikipedia pages as this app has total. I have no problem paying for useful apps. This isn't one of them.
We need to buy for the full version
...as mentioned before me - little substance!!!
i like it than better
Electrical Engineering is an awesome educational app for the engineering students (Y)
Electrical Engineering is an awesome educational app
nyc app .... good work