Waves (correct my mistakes please) AM waves are loaded by adjusting capacity. The data on the carrier is added through the change in the capacity of the wave (its length from top to bottom). This system began to decline due to poor sound quality compared to FM waves. PM waves are usually used to broadcast world news and events, the most notable disadvantages being confusing the stations during the change and are affected by confusion but characterized as long-term and can operate outside the cities and easy to build.

The difference between generations of mobile communications (correct my mistakes please) The first generation is available to speak or hear which means you can't talk and listen at the same time (send or receive). second generation voice call and SMS . third generation calls ,SMS and animated messaging . Generation 3.5 voice calls , text messaging , media , video calls and the internet . the fourth generation all mentioned in addition to the speed of the internet . and finally we got to the fifth generation .

3-D printing ( correct my mistakes please) 3-D printing is a form of manufacturing technology where a three-dimensional object is formed by palcing successive thin layers of a substance on top of each other and three printers Dimensions are usually faster , more economical and easier to use than other technologies and three-dimensional printers allow developers the ability to print complex parts.

Circuits ( correct my mistakes please) Electronic circuits is a closed path of electronic components connected to each other and the electrical current can pass through it and it is the main component to all electronic devices . Electronic circuits use in several areas such as measurement , controlling and signal processing and it consists mainly of resistance , capacitor and transistors .

Data collection (correct my mistakes please) Data collection is the collection and measurement of electrical signals from the outputs of sensors and power switches and then entered into the computer for processing . We use sensors to convert the physical signal to an electrical signal (voltage , current, ..etc) because the electrical signal has many characteristics such as the easy of transporting and storage

Arduino 2 (correct my mistakes please) Arduino is used primarily in designing electronic interactive projects or projects that used to build different environmental sensors like :(pressure, wind and temperature) and we can connected Arduino with different programs on the (p.c) and it's programming depends on the open_source programming language and it's programming codes similar to (C) programming language and it is easiest programming language used in controllers programs

Arduino (correct my mistakes please) Arduino is an electronic development board consists of an open_source electronic circuit with microcontroller on the same board and have programmed by computer and designed to make the process of using interactive electronics in multi projects easier

Optical fibers (correct my mistakes please) Optical fibers are made of glass or plastic designed to guide the light to go with it's length , and are used widely in optical fibers communication which transfer signals to far distance and with data ranges faster than other communications methods and we use fibers instead of metals wires . The optical fiber is long and thin like hair thickness many of fibers are collected inside the optical cabels and have used to transfer the optical signals to very far distance.

Optimistic feeling (correct my mistakes please) Most of the times I feel I'm lonely, I feel tired I feel that I want to give up , I don't want to complete my way but I say to myself wait a minute what are you doing ?!! if you didn't move to your dreams then this life will push you back and beat you but with hope and optimistic in human life every day and when we keep going to make our goals come true that makes the taste of life is sweet.