Energy resources and transfers

Question 1

Energy stores

Answer 1

Chemical
Kinetic
Gravitational
Elastic
Thermal
Magnetic
Electrostatic
Nuclear

Question 2

Energy

Answer 2

Cannot be created or destroyed, it can only be transferred along a pathway

Question 3

Energy Pathways

Answer 3

Mechanically
Electrically
Heating
Radiation (light and sound)

Question 4

Energy transfer diagrams

Answer 4

Useful energy ->
Wasted energy î

Question 5

Efficiency

Answer 5

(Useful output energy / Input Energy) * 100

Question 6

Movement of heat

Answer 6

Conduction
Convection
Radiation

Question 7

Conduction

Answer 7

• Heat transfer along solids
  molecules are made to vibrate as energy is transferred to them.
• The heat is passed on by collisions of molecules.
• These vibrations are bigger when more energy.

Question 8

Convection

Answer 8

• Heat transfer along gas or liquids.
• When the fluid is heated, it expands, making it less dense than colder fluid.
• The warmer fluid will start to move upwards. - This is called a convection current.
• This is how heat reaches us from radiators from the room.

Question 9

Radiation

Answer 9

• Heat transfer through gases and space.
• Moves around in electromagnetic waves.
• Any hot object emits heat radiation; the hotter, the more radiation.
• Infra-red, too much can cause burning.
• Dark matt colours absorb AND emit the most radiation.
• Light shinny colours will reflect the most radiation

Question 10

Theramal Insulation (home)

Answer 10

Roof - loft insulation (foam)
Walls - wall insulation (foam)
Windows - double glazing
Door - draught excluder
Floor - carpets / wooden floor

Question 11

Work done equation

Answer 11

(J) = force (N) x distance (m)
Wd = F x d

Question 12

Gravitational Potential Energy equation

Answer 12

GPE (J)= mass (Kg) * g (10)* height (m)
GPE = mgh

Question 13

Kinetic Energy equation

Answer 13

KE (J)= 1/2 * mass (kg) * speed2 (m/s)
KE = 1/2 mv2

Question 14

Speed equation (mass)

Answer 14

v = √(2*KE)/ mass

Question 15

Speed equation (no mass)

Answer 15

v = √2gh

Question 16

Power

Answer 16

• A measure of how fast the energy changes form one form to another. It is the rate at which work is done.
• Watts

Question 17

Power equation

Answer 17

P (Watts) = Work done (J) / time (s)
P = W / t