Transfer of thermal energy Flashcards Preview

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Flashcards in Transfer of thermal energy Deck (13):
1

what is conduction

moving from a higher temperature to a lower temperature

2

what is the best conductors

diamond
silver
copper

3

worst conductors

glass wool
rubber
wood

4

what is an insulator

a material that is a bad conductor

5

why are metals good conductors?

delocalised electrons. can carry energy when heat is transferred.

6

what is convection

heat transfer in fluids. when heated fluid is less dense and rises and colder fluid sinks

7

what is a convection current

is a movement of fluid that carries energy from a warmer place to a cooler on.

8

where can heat be lost in the house

through the roof
through windows
space around the door
through the walls
through the floor

9

how can heat leave the house

can be lost via radiation through the walls

10

what does insulating material do

reduces heat loss via conduction

11

mnemonics for all the forms of energy

Most Kids Hate Learning GCSE Energy Names

magnetism
kinetic energy
heat (thermal)
light
gravitational potential
chemical
sound
elastic
electrical
nuclear

12

radiation

all objects give out and take in thermal radiation, which is also called infrared radiation. the hotter an object is, the more infrared radiation emits.

infrared radiation is a type of electromagnet radiation that involves waves. doesn't need a medium and no particles are needed.

if two objects are the same material and have the same volume, the flat thin one will radiate the most heat energy faster than a fat object. that is why there are radiators in a domestic household.

13

Infrared radiation.

travels by EM waves and can therefore travel in a vacuums as they do not require particles.