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Flashcards in P3 Energy Deck (17):
1

Energy stores

Gravitational potential energy
Chemical
Nuclear
Elastic potential energy
Kinetic
Thermal

2

Energy transfers

Heat
Sound
Light
Electric
Work done

3

Efficiency formula

Efficiency = useful energy out/total energy in

4

Principal of energy conservation

Energy cannot be made or destroyed only stored or transfered

5

How to represent energy transfer

Sanely diagrams

6

3 ways of heat transfer

Conduction
Convection
Radiation

7

How to stop conduction

Use pockets of gas or rubber connections between materials because rubber is a bad conductor

8

How to stop convection

Use a vacuumed

9

How to stop radiation of heat

Use reflective surfaces to reflect heat back

10

An objects gravitational potential energy depends on(3 factors)

Mass
Gravitational field strength
Height(distance from gravity source

11

An objects kinetic energy depends on(2 factors)

Mass
Velocity

12

Earths gravitational field strength

9.81N(10N)

13

Kinetic energy =

1/2 * mass* (velocity)^2
KE = 1/2*m*(v)^2

14

Gravitational potential energy =

Mass * gravitational filed stregnth * height
GPE = m*g*h

15

Renewable energy

Wind(kinetic)
Solar(thermal)
Tidal+wave(kinetic)
Hydroelectric(kinetic)
Biomass(chemical)
Geothermal(thermal)

16

Non-renewable energy

Fossil fuels(chemical)
Nuclear

17

Ways to reduce energy wastage

Lubrication
Thermal insulation