P2 - Energy Transfer by Heating Flashcards
What are the best conductors of energy?
Metals.
What are the best insulators?
Non-metals, like wool or fibreglass.
What is thermal conductivity?
A rate of how fast energy transfers through a material - the higher this is, the faster energy transfers.
What factors effect energy transfer rate?
Thickness of material, temperature difference across a material, and thermal conductivity of a material.
What is infrared radiation?
A type of wave on the electromagnetic spectrum. All objects emit and absorb infrared radiation - the hotter an object is, the more infrared radiation is emits in a given time. Blackbody objects emit all radiation hitting it, and the radiation it gives out is extremely intense.
What is specific heat capacity?
The amount of energy needed to change the temperature of 1kg of a substance by 1 degree celcius.
How do we work out energy transferred?
Energy Transferred = Mass * Specific Heat Capacity * Temperature Change
How do we work out specific heat capacity?
Specific Heat Capacity = Energy Transferred / Mass * Temperature Change
How is energy transfer to outside reduced in houses?
- Loft insulation
- Double-glazed windows
- Foil behind radiators
- Thicker bricks
