1. Engineering Technology… Team member: 1) Ayra Umayrah 2) Ahlam Awateef 3) Waseem Akram 4) Ameerul Ahwaz 4 MODEM

2. THE PRODUCTION OF ELECTRICAL ENERGY

3. oThe sun is another main source of energy on earth. oIt is believed that the sun temperature is about 15 million Kelvin. oSOLAR RADIATION The released energy makes its way to the sun’s surface (photosphere) and then to outer space in the form of electromagnetic radiation (electric wave and magnetic field). oElectricity is generated when solar radiation is directed to a voltaic photocell. oThe electrical energy is limited and small in quantity depending on the amount of radiation.

4. oElectricity cannot be obtained in the dark. oSolar energy is used, e.g, in calculators and watches. oBigger electricity generation systems that use solar panels to collect heat by heating liquid in the panel tubes. oLiquid will turn into high pressure steam. oThe steam is then conveyed to the turbine to turn the generator, thus generating electricity. oBatteries are installed into the system to retain the electrical energy when there is no solar (at night).

5. oBatteries are only functional in the absence of the sun. oAll the control processes are made automatic. oUsually, solar panel are installed on rooftops. oSolar energy can also be used to supply hot water in a building. oHot water produced is collected in a special tank and is released when required.

6. ELECTRICAL POWER STATION TYPE OF STATION LOCATIONADVANTAGESDISADVANTAGES SOLAR Any place where there is sunlight. Very appropriate for remote areas. Free source of energy. Energy is renewable. No pollution. Equipment to convert energy is expensive. Energy depends on the sunlight.