PHYSICS 1A
REVISION FOR PHSYICS 1A ENERGY AND ELECTRICITY
- Created by: beth clarke
- Created on: 19-05-11 16:38
HEAT ENERGY CAN BE TRANSFERED INTO RADIATION CONDUCTION OR CONVECTION
THERMAL RADIATION IS TRANSFER OF HEAT ENERGY BY ELECTROMAGNETIC WAVES
CONDUCTION INVOLES THE TRANFER OF ENERGY BY PARTICLES ITS THE MAIN FORM OF HEAT TRANSFER IN SOLIDS
CONVECTION INVOLVES THE TRANFER OF HEAT BY PARTICLES AND IS THE MAIN FORM OF HEAT TRANSFER IN LIQUIDS AND GASES
THE BIGGER THE SURFACE AREA THE MORE WAVES CAN BE EMMITED
AN OBJECT THATS HOTTER THAN ITS SURRONDINGS EMITS MORE RADIATION THAT IT ABSORBS AN OBJECT THAT COOLER THAN IT SURROUNDINGS ABSORBS MORE RADIATION THAN IT EMMMTS
DARK MATT SURFACES ABSORB HEAT AND EMIT MORE HEAT RADIATION THAN WHITE OR SILVER THEY REFLECT
CONDUCTION OF HEAT IS THE PROCESS WHERE VIBRATING PARTICLES PASS THERE EXTRA KINETIC ENERGY TO OTHER PARTICLES
METALS ARE BETER CONDUCTERS THAN PLASTIC OR WOOD BECAUSE ELECTRONS ARE FREE TO MOVE INSIDE THE METAL COPPER IS A GREAT CONDUCTER
CONVECTION OCCURS WHEN THERE ARE MORE ENERGETIC PARTICLES MOVE FROM THE HOTTER REGION TO THE COOLER REGION AND TAKE ENERGY WITH THEM
CONVECTION CURRENTS ARE ALL ABOUT CHANGES IN DENSITY
ELECTRICAL ENERGY-WHENEVER A CURRENT FLOWS
LIGHT ENERGY-FROM SUNS LIGHT BULBS ECT
SOUND ENERGY -FROM ANYTHING NOISY
KINETIC ENERGY- FROM ANYTHING MOVING
NUCLEAR ENERGY-RELEASED FROM NUCLEAR REACTIONS
THERMAL ENERGY-FLOWS FROM HOT OBJECTS TO COOLER ONES
GRAVATATIONAL POTENITIAL-ANYTHING THAT CAN FALL
CHEMICAL ENERGY- IN FOODS FUELS AND BATTERIES
ELECTRICAL DEVICES CONVERT ELECTRICAL ENERGY TO SOUND LIGHT HEAT ECT EG TV OR SPEAKER
BATTERIES CONVERT CHEMICAL ENERGY TO ELECTRICAL ENERGY EG TOY CAR
GRAVATATIONAL AND ELASTIC ENERGY ALWAYS GET CONVERTED TO KINETIC ENERGY FIRST EG CRANE
IN A SANKEY DIAGRAM THE THICKNESS OF AN ARROW REPRESTENTS HOW MUCH ENERGY THE THICKER THE ARROW THE MORE ENERGY
THE NATIONAL GRID TAKES ELECTRICIAL ENERGY FROM POWER STATIONS TO HOMES ECT TO TRANSMIT ENERGY YOU NEED EITHER A HIGHT CURRENT OR VOLTAGE WE DONT USE HIGH CURRENT AS YOU LOOSE ALOT OF ENERGY THROUGH HEAT
NON RENEWABLE ENERGY LIKE COAL OIL NATURAL GAS AND NUCLEAR FUELS WILL RUN OUT THEY ALL EFFECT THE ENVIROMENT BADLY
RENEWABLE ENERGY WILL NEVER RUN OUT LIKE WIND WAVES SOLAR ECT SOLAR ENERGY HOWEVER IS EXPERNSIVE BUT NO ENVIROMENTAL DAMAGE AND WIND POWER INVOLVES TURBINES AND ARE VERY NOISY
WAVE POWER IS NO POLLUTION BUT SPOIL VEIW MINIMAL RUNNING COST
TIDAL BARRIERS HAVE NO POLLUTION BUT STOPS FREE ACCESS FOR BOATS SPOILS VEIW MINNIMAL RUNNING COSTS
BIOMASS IS A TERM FOR ALL ORGANIC THINGS THAT CAN BE BURNT TO PRODUCE ELECTRICITY EG FARM WASTE
ENERGY EFFICIENCY IN HOMES
CAVITY WALL INSULATION REDUCES HEAT LOSS BY REDUCING CONVECTION AND RADIATION
LOFT INSULATION REDCES HEAT LOSS BY REDUCING CONDUCTION AND RADIATION
DOBLE GLAZING MEANS MORE RADIATION IS REFLECTED BACK REDUCES CONDUCTION
THICK CURTAINS REDUCE HEAT LOSS BY CONDUCTION AND RADIATION
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