Physics Keywords

Question	Answer
U-values	A u-value is the amount of energy that passes through 1 metre squared of material. The lower the u-value the better the insulator and the less energy lost.
Dense	Dense is how tightly packed particles are.
Conduction	Conduction is the transfer of energy in a solid.
Radiation	Radiation is the transfer of heat energy using waves. No particles are needed.Everything gives off radiation; different surfaces give off different amounts.
Convection	Convection is the transfer of energy in a fluid - a liquid or gas.
Efficiency	Efficiency is how well a machine changes energy into useful forms of energy. Efficiency = (Useful energy out/total energy in) x 100
Energy used	Energy used = power(kw) x time(h)
Infrared radiation	Energy transfer by electromagnetic waves. All objects emit radiation. The hotter the object is the more radiation it is emitting at any given time.

Resource summary

	Created by Becca Westwell over 10 years ago