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Electricity is generated from generation stations such as HEP (Hydro-Electric Power), Solar, Geothermal e.t.c and are interconnected together by the grid system. Generally, electricity used in homes comes from a very far distance and involve a whole lot of process before it finally gets to your home. This process can be classified into 3 main parts which are:  1. Generation  2. Transmission  3. Distribution 1. Generation  It is the root process where electricity is been generated. This generation of electricity comes from various source such as: Hydro-Electricity Power (HEP), Geothermal, Natural Gas, Biodiesel e.t.c. The generation of electricity is usually at a voltage level of 16kV at a frequency of 50Hz and step up by the station transformer to a voltage level of 330kV and because of the fact that its been generated from different location and source there is therefore need of interconnecting all this power station together to a network known as the natio

Below are the PDF/ebooks meant for all categories of student studying mathematics, engineering or science related course.  1. Basic Engineering Mathematics 2. Handbook of Mathematics 3. Oxford Mathematics Dictionary 4. College Mathematics - Shaums 5. Advance High School Mathematics - David B Surowski (Shangai American School, Singapore American School) 6. Mathematics for Computer Science - Eric Lehman   7. GRE Mathematics test practice book   8. Mathematics and Algebra - US Navy Department   9. Advanced Calculus - Havard University Department of Mathematics   10. Teaching of Mathematics   11. Algebraic Logic - H.Andreka, I.Nemeti, I.Sain   I hope you find it interesting. Have a blissful reading session

Below are ebooks in PDF format for Electrical/ Electronics Engineering Student. They contain vital information/topics on Electric Circuits and Circuit Theory Analysis and Electronics majorly meant for the student of tertiary institution. Am sure it will be useful.. 1. Electrical Circuit Theory - By Dr.Ing 2. Basic Electrical and DC Theory - US Department of Energy 3. Fundamental of Electrical Engineering 4. Circuit Theory 5. AC circuit Theory 6. A first course in Electrical and Computer Engineering.   - Louis Scharf 7. Electrical Circuit Theory Second Revised Edition - John Bird 8. Electromagnetic Field Theory for Physics and Engineers - R. Gomez Martin 9. Electrical Study Guide - Michelin North America 10. Electricity DC circuit 11.  Mc Graw Hill Electrical and Electronics Engineering Series - Engineering Electronics 12. Lab 3 - DC Circuits Also, for Electrical Engineering PDF ebooks from UNESCO majorly for Polytechnics student and as per each Nigerian

Our cellphone is where we mostly save our personal contact and its obvious that once we lost the phone, perform factory reset or wipe the phone. Contacts and information saved on it will all be gone which in most cases unbearable to us. You might even like to wipe your phone or perform a factory reset on your phone for some reason or the other but contact lost will however become a threat to you.  However, there are some ways in which this important contacts of ours can be saved/backed-up to gmail or other services for emergency use so that when we lost our phone. We can actually recover this if probably we have backed it up to gmail or PC. Here is how to back-up phone contact to gmail 1. Firstly, log-in to your gmail account and on the left corner where it says Gmail. Click on the drop down option and click on Contact. If you see your contacts, it means your phone backed it up automatically already. If not proceed to step 2 2. Go to your phone settings and locate "AC