AQA ENERGY MARCH

UNITS

100

Power

Watts

200

Efficiency

No unit / %

300

Spring constant

N/m

400

Gravitational field strength

N/Kg

500

Specific heat capacity

J/Kg^oC

Energy resource

100

High power, renewable, restricted locations (2) 

Tidal / Hydro electric

200

High power, non-renewable, restricted locations (1)

Nuclear

300

Doesn't gain energy directly/indirectly from the sun. (3)

Tidal, nuclear, geothermal

400

Weather dependent (2)

Solar, wind

500

Doesn't involve a generator

Solar

Equations

100

E_k =

1/2 mass x speed²

200

Ee = ?

1/2 spring constant x extension²

300

Graviational field strength =

GPE / Mass x Height

400

1000W =

1 Kilowatt

500

1000 000 000W = 

Gigawatt

Energy transfers

100

Chemical --> Gravitational

Rocket

200

Gravitational --> Kinetic 

Falling object

300

Kinetic energy --> Thermal

Slowing object

400

4 energy transfer pathways (4)

E

M

R

T

Electrical

Mechanical

Radiation

Thermal

500

Three ways to reduce unwanted energy transfers (2)

Insulation

Lubrication

Streamlining

General

100

A joule per second

A watt

200

The energy required to raise 1Kg by 1^oC

Specific heat capacity

300

How easy/difficult it is for heat to move through a substance

Thermal conductivity

400

Greenhouse gases (3)

Methane

Carbon dioxide

Water vapour

500

The First Law of Thermodynamics

Energy cannot be created or destroyed