Great Neck South Middle School Technology Energy and Electricity Introduction
Embed Size (px)
Transcript of Great Neck South Middle School Technology Energy and Electricity Introduction
Energy and Electrical Definitions
Great Neck South Middle School
Energy and Electricity Introduction
What is energy?Energy is the ability to do work, or cause change. Energy is literally what makes the world and everything in it go. Energy is the magic stuff stored in the battery that makes the flashlight work. The gasoline in a cars gas tank contains energy. The cars engine merely converts the gasolines energy into a usable form.
While there are many forms and sources of energy, there are only two types: Potential Kinetic Kineticenergy associated with motion.
When discussing kinetic energy, its important to keep in mind that the mass and velocity of an object determine its kinetic energy. We can take a look at kinetic energy by throwing a basketball and a baseball.
PotentialThe energy something has which is stored and not moving.the energy that a piece of matter has because of its position or because of the arrangement of parts because the matter has the potential, or opportunity, to do work. There are two types of potential energy: elastic potential energy and gravitational potential energy. Water behind a dam has gravitational potential energy.A stretched rubber band has elastic potential
Forms of energyMechanical the energy of motion Electrical think lightning or electricity moving through electrical wires Electromagnetic or radiant energy of magnetism and light Chemical energy produced by chemical reactions like those that occur in batteries Nuclear potential energy stored in the nuclei of atoms Sound the energy of vibrating sound waves Heat from burning fuel or the earth
Energy ConversionMany of the devices we use every day convert energy from one form to another.These devices are called transducers. TransducersFlashlight converts chemical energy (stored in the battery) to electrical energy to light the bulb. The bulb converts the electrical energy to electromagnetic or radiant energy.
TransducersToaster converts electrical energy into thermal energy.
Car engine converts the chemical energy stored in the gasoline into mechanical and thermal energy.
What do transducers do?Convert one energy type to another.How do we produce electricity?Generators - - - - > MechanicalBatteries - - - - - > ChemicalsPhotovoltaic Cells - > LightPiezio electric - - > Pressure
Generator A mechanical device that produces electricity by a process of rotating a magnet inside a coil of copper wire. A generator is a transducer that uses rotary mechanical motion to produces electricity.
Industrial & Home Electrical Generators
Renewable Energy Vs. Non RenewableNatural Energy All Renewable Non Consumed when usedSolarWindWaterGeothermalEnergy Existing in NatureNatural energy sources are ALL RENEWABLEWind EnergyWind Farm
Wind Turbine Generator
LIPA wind farmHeat EnergyGeothermal heat from the earth
Solar Thermal heat from the sun
Solar EnergyLight HeatSolar EnergyLight energy -- Electrical energyUses Photovoltaic Cell
Water must be MovingHydroelectric Power- dams & riversTidal vertical movement of tidesWave using the up/down motion of wavesThermal-using the temperature difference of oceans
Oregon State Wave ParkA 2.25-megawatt project off the coast of Portugal went on line this fall (2008), becoming the world's first commercial wave-energy development in operation. It can supply 1,500 households with electricity.Ocean Thermal
Energy from FuelsMust Be Burned to Create SteamPolluteSome are :RenewableNon RenewableRenewable FuelsReplaceable in a short period of timeBiomass - - - - -> Once alivePlantsTrees-WoodCorn, Sugar Cane Ethanol AlcoholAlgaeGarbage
Biomass as FuelsNon Renewable Fuels
Non Renewable FuelsFossil FuelsPetroleum- OilGasolineHeating OilPlasticsCoalNatural GasNon Renewable EnergyNuclear Fission - split atomsFusion combine atoms
Energy ConservationShut off lightsFluorescent/Compact lights
What do biomass and fossil fuels have in common?BurnablePollute
Name two advantages to fuels and why we use them.PortableStorableWhat energy source do you think is the safest, cleanest, easiest to use?Great New York Blackout
Hopefully Not The End