Cell is a basic unit of all living things Life processes
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SCIENCE ( only informations )
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Current electricity also move when lighting strikes the earth
Matter through which an electric current moves easily is called a conductor Matter that isn’t a good conductor is called an insulator The path through which an electric current flows is a circuit A series circuit is open in which current can follow only one page A parallel circuit is one in which current can follow more than one path A generator changes energy of motion into electrical energy A turbine is a device that is made up of a wheel and blades An electric cell is a device that changes chemical energy to electrical energy A dry cell uses a chemical paste, carbon rod, and zinc case to produce a flow of electrons The chemical reaction of the metal and acid produces a flow of electrons. Such a battery is called a wet cell battery Mechanical energy is energy of moving machine parts An electric motor is a machine that changes electrical energy to mechanical The filament is a thin coil of wire The amount of work that is done in a certain period of time is called power Small amounts of electric power are measured in units called watts A kilowatt is 1,000 watts A kilowatt-hour is equal to 1,000 watts of electricity used for 1 hour Fuses and circuit breakers protect buildings against fire CHAPTER 8 A fossil fuel is a fuel that forms from the remains of dead plants and animals Oil that is taken from the earth is called crude oil Crude oil changed to useful products in a refinery In combustion, oxygen from the air combines with a fuel, producing heat and light The energy stored in the nucleus of an atom is called nuclear energy In nuclear fission the nucleus of an atom is split, releasing energy In nuclear fusion the nuclei of atoms are combined, releasing energy The word nuclei means “more than one nucleus” Fission takes place in a special structure called a nuclear reactor Download 36.5 Kb. Do'stlaringiz bilan baham: 
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