Physics Aqa P1A
1 ) 1 Thermal Radiation
* Heat or warmth radiation is a transfer of energy by infra-red waves. 2. Thermal radiation is energy transfer by simply electromagnetic dunes. * Most objects emit thermal radiation.
* The warmer an object, the more thermal light it releases. * High temperature radiation can travel through vacuum pressure.
1 . two Surfaces and Radiation
* Dark, ellen surfaces are better emitters of energy radiation than light, bright surfaces. 2. Dark, he surfaces will be better absorbers of cold weather radiation than light, sparkly surfaces.
1 ) 3 Louage
* Conduction largely occurs in solids. Most liquids and gases will be poor conductors. * Louage in a material is due mainly to free of charge electrons shifting energy within the metal. 2. The particles gain kinetic energy and vibrate even more; this is then passed upon neighbouring particles etc . * When metals are heated free electrons gain kinetic energy and move through the metal and transfer strength by colliding with other debris. * nonmetals are poor conductors because they do not possess free bad particals. * Fibreglass is a good insulator because they will contain wallets of captured air.
1 . 4 Convection
* Polymers can be built with specific properties by choosing different monomers and by changing the conditions used to make sure they are
1 . a few Heat Transfer by Design
* A radiator includes a large area so warmth can be lost easily. * Small objects lose warmth more easily than large things. * Warmth loss via a building can be decreased by using:
5. Aluminium foil behind radiators.
* Cavity wall padding.
* Double glazing.
5. Loft padding.
* Employing shiny, lumination surfaces that are poor emitters of heat. * Trapping atmosphere in small pockets.
* To maximise high temperature loss to keep things great we can make use of:
* Great conductors.
5. Paint things dull dark.
* Have got air flow around them maximised.
1) Term 3 types of heat copy.
2) Which type of heat copy occurs generally in shades?
3) Exactly how are convection currents set up in fluids?
4) Describe the process of warmth transfer through a metal. 5) What elements affect the amount of heat radiated by a physique? 6) What makes gases poor conductors?
7) How does surface color affect the price of conduction? 8) Why do central heating radiators have large surface area areas? 9) Why does a concrete ground feel cooler to your ft than a carpeted floor exact same temperature? 10) Why are warm water tanks typically wrapped in glass dietary fibre jackets?
2 . 1 Kinds of Energy
5. Energy can easily transform in one form to a different.
Light| In the Sun or possibly a lamp.
Thermal| Flows coming from a sizzling object to a cold thing.
Sound| Coming from a loudspeaker or a words.
Kinetic| Anything moving.
Nuclear| From elemental reactions.
Electrical| Whenever an electric current runs.
Gravitational Potential| Stored in any object that may fall. | Chemical| Kept in fuels, foodstuff and battery packs released the moment chemical reactions have taken place.
2 . 2 Preservation of Energy
5. Energy can be transferred from one place to one other.
* The total amount of energy is always the same (this is the preservation of energy). * E. G. when an object comes, GP (gravitational potential energy) is transformed into kinetic strength.
2 . 3 Useful Energy
* Beneficial energy can be energy inside the place we wish it and the form we need it. * Wasted energy is energy that is not useful energy.
Input Energy sama dengan Useful Energy + Squandered Energy
Suggestions Energy = Useful Energy + Wasted Energy
2. As energy spreads away, it gets more and more challenging to use for further energy transfers. 2 . 5 Energy and Efficiency
2. Energy is definitely measure in joules (J)
* The less energy waster with a device the greater efficient the unit is. * Wasted energy causes inefficiency.
* Zero device could be 100% useful except a power heater, which usually...