I need three sources books that describes how electrical eng

I need three sources books that describes how electrical engineering is important?
I have to do an essay but I need 3 free books (able to download free)
thank you so much

Solution

Most of electrical engineering was invented by 1925, reduced to practice by 1935, and
mathematically analyzed and scientifically understood by 1945. So what makes this book different?
Symbolic computation programs such as MATLAB, MuPAD, and Mathematica eliminate calculators
and time consuming math. Cloud computing at sites like Circuit Lab make simulation possible on a
cell phone. This leaves room for more material to be covered at greater depth.
This Course
The 1st and 2nd order differential equations can be solved with Euler\'s equation (phasors) and
calculus. This solution technique is compared with Laplace transforms. The course builds on
Kirchhoff\'s laws to write differential equations using transfer functions. The particular solution
reduces to a final condition if sources are replaced with a unit step function. All that needs to be
calculated is the homogeneous step response. Then response to any complex voltage or current
source can then be found through the convolution integral.
Requirements
This book will expect the reader to have a firm understanding of Calculus specifically, and will not
stop to explain the fundamental topics in Calculus. This book shows where Laplace transforms
provide an alternative solution, but only in a few examples in parallel with phasor solutions.
This book is not nearly completed, and could still use a lot of work. People with knowledge of the
subject are encouraged to contribute.
A PDF version is available. (info)
This book requires that you first read Calculus.
This book is intended for advanced readers.
This book has a collection providing an on-demand
PDF version as well as a
printed book. (edit) (help)
A printable version of Circuit Theory is available. (edit it)
https://drive.google.com/file/d/0B2KwEOoFGPTGU21EMFh5ZlZudHc/view?usp=sharing