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# P1

### Energy for the Home

What is specific heat capacity? A measure of how much energy a substance can store: The amount of energy needed to raise the temperature of 1kg of a substance by 1 degree celcius.
What is the specific heat capacity of water? 4200 J/kg/degree c
What is the unit for specific heat capacity? J/kg/degrees c
Why are there flat spots on a heating graph? Energy is being used to break intermolecular bonds rather than raising the temperature. (melting and boiling)
What is specific latent heat of melting? Amount of energy needed to melt 1kg of material withou changing its temperature. (i.e the material has got to be at its melting temperature already)
What is specific latent heat of boiling? Energy needed to boil 1kg of material without changing its temperature (i.e the material's got to be at its boiling temperature already)
What is the unit for specific latent heat? j/kg
What is conduction? Conduction of heat is the process where vibrating particles pass on extra kinetic energy to neighbouring particles.
What is convection? Convection occurs when the more energetic particles move from the hotter region to the cooler region - and take their heat energy with them. This is because when you heat up a liquid/gas it expands (particles move faster) meaning it becomes less dense mea
What uses convection in the home? Radiators
Why can't convection happen in solids? Particles can't move - vibrate on spot
How do you reduce convection? Stop the fluid moving. Clothes, blankets and cavity wall foam insulation work by trapping pockets of air.
In what ways is radiation different from convection and conduction? 1) Radiation occurs in a vacuum 2) It can only occur through transparent substances. 3) Amount of radiation emmitted absorbed by an eobject depends to a large extent on it's surface colour and texture.
Why are survival blankets made of shiny material? it reflects the body heat back inside the blanket and minimises heat radiation being emitted by the blanket.
What saves energy and money for the home? Insulation
how can you insulate your home? Loft insulation Cavity Walls Draught proofing Hot water tank jacket Double glazing Thick Curtains
What is used to see where your house is losing heat? Thermogram
How does a thermogram work? Objects at different temperatures emit infrared rays of different wavelengths. Red and yellow show where heat is being lost.
What is wavelength? The length of a full cycle of a wave e.g crest to crest.
What is wave frequency? The number of complete waves passing a point per second. Measured in Hz
What are the 7 electromagnetic waves? Gamma Rays, X rays, Ultraviolet, Visible Light, Infrared, Microwaves, Radiowaves
Created by: molly12345

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