PHYSICS 1A

REVISION FOR PHSYICS 1A ENERGY AND ELECTRICITY

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HEAT ENERGY CAN BE TRANSFERED INTO RADIATION CONDUCTION OR CONVECTION

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THERMAL RADIATION IS TRANSFER OF HEAT ENERGY BY ELECTROMAGNETIC WAVES

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CONDUCTION INVOLES THE TRANFER OF ENERGY BY PARTICLES ITS THE MAIN FORM OF HEAT TRANSFER IN SOLIDS

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CONVECTION INVOLVES THE TRANFER OF HEAT BY PARTICLES AND IS THE MAIN FORM OF HEAT TRANSFER IN LIQUIDS AND GASES

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THE BIGGER THE SURFACE AREA THE MORE WAVES CAN BE EMMITED

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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

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DARK MATT SURFACES ABSORB HEAT AND EMIT MORE HEAT RADIATION THAN WHITE OR SILVER THEY REFLECT

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CONDUCTION  OF HEAT IS THE PROCESS WHERE VIBRATING PARTICLES PASS THERE EXTRA KINETIC ENERGY TO OTHER PARTICLES

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METALS ARE BETER CONDUCTERS THAN PLASTIC OR WOOD BECAUSE ELECTRONS ARE FREE TO MOVE INSIDE THE METAL COPPER IS A GREAT CONDUCTER

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CONVECTION OCCURS WHEN THERE ARE MORE ENERGETIC PARTICLES MOVE FROM THE HOTTER REGION TO THE COOLER REGION AND TAKE ENERGY WITH THEM

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CONVECTION CURRENTS ARE ALL ABOUT CHANGES IN DENSITY

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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

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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

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IN A SANKEY DIAGRAM THE THICKNESS OF AN ARROW REPRESTENTS HOW MUCH ENERGY THE THICKER THE ARROW THE MORE ENERGY

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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

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NON RENEWABLE ENERGY LIKE COAL OIL NATURAL GAS AND NUCLEAR FUELS WILL RUN OUT THEY ALL EFFECT THE ENVIROMENT BADLY

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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

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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

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BIOMASS IS A TERM FOR ALL ORGANIC THINGS THAT CAN BE BURNT TO PRODUCE ELECTRICITY EG FARM WASTE

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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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Comments

Al

Would be helpful, for foundation tiers.

Could of improved by including details and more examples to reinforce definitions.

Good 20 paged refresher.

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