# Physics Keywords

Flashcards by Becca Westwell, updated more than 1 year ago
 Created by Becca Westwell almost 7 years ago
77
2

### Description

GCSE Science (Physics) Flashcards on Physics Keywords, created by Becca Westwell on 04/23/2014.

## Resource summary

 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.

### Similar

GCSE AQA Physics - Unit 3
GCSE AQA Physics 1 Energy & Efficiency
AQA Physics P1 Quiz