Energy Rescorces And Transfers

Question 1

Can energy be created or destroyed

Answer 1

No

Question 2

Efficiency = ?

Answer 2

Useful energy output / total energy input *100

Question 3

What are Sankey diagrams

Answer 3

Diagrams that show the efficiency of something, the waste energy points down and the useful energy points to the right

Question 4

Conduction

Answer 4

When particles near a heat source begin to vibrate meaning neighbouring particles also begin to vibrate and so the heat energy is moving

Question 5

Convection

Answer 5

When a group of particles are heated it causes them to become less dense meaning they rise and cooler air fills the vacuum they left

Question 6

Radiation

Answer 6

Emission of infrared waves (it can occur in a vacuum)

Question 7

How do you insulate from

1) conduction
2) convection
3) radiation

Answer 7

1) double glazing
2) loft insulation
2) reflective foil

Question 8

Force ,distance moves ,work done

Answer 8

Work done = force * distance moved

Question 9

Energy transfer and work done

Answer 9

Work done = energy transfer

Question 10

Mass gravity GPE height

Answer 10

GPE = mass * gravity * height

Question 11

Mass speed kinetic energy

Answer 11

Kinetic energy = 1/2 * mass * speed2 (squared)

Question 12

Define power

Answer 12

The rate of transfer of energy

Question 13

Time taken power work done

Answer 13

Power = work done / time taken

Question 14

Name 5 renewable energy extraction techniques

Answer 14

Wind turbines 
Geothermal rescouces 
Solar panels 
Nuclear power 
Hydroelectricity