Energy Resources And Transfer

Question 1

What is a sankey diagram ?

Answer 1

“An attention grabbing flow chart that helps in the quick visualisation of the distribution and losses of energy in a process “

Question 2

Whats the equation for efficiency ?

Answer 2

Efficiency = useful energy output
————————x 100
Total energy input

Question 3

Name the three possible methods of heat transfer

Answer 3

Conduction -
Convection-
Radiation

Question 4

Explain conduction

Answer 4

The passing of kinetic energy via vibration of particles

Question 5

Why are metals good at conduction ?

Answer 5

They contain delocalised electrons which help the kinetic energy pass on

Question 6

What is convection ?

Answer 6

When the particles in a fluid are heated they expand there for rise up and the cooler particles are more dense there fore sink down , towards the heat supply in which they are also heated . This is called a convection currents

Question 7

What is radiation ?

Answer 7

Radiation is the transfer of heat via infrared waves .

Question 8

How do matt black surfaced and shiny white surfaces react to radiation differently ?

Answer 8

Matt black - best emitters and absorbers of radiation

Shiny white -reflect the best

Question 9

How can you stop conduction , convection and radiation if a house ?

Answer 9

Conduction - double insulation ,anything trapping air so a small vacuum can be formed
Convection-loft insulation to stop loss of less dense air that has risen
Radiation - lining walls with reflective foil

Question 10

Name all of the kinds of energy

Answer 10

Thermal energy
Light energy
Electrical energy
Sound energy
Kinetic energy
Chemical energy
Nuclear energy
Elastic potential energy
Gravitational potential energy