Energy Conservation Flashcards

1
Q

Energy stores

A

-kinetic
-chemical
-thermal
-internal
-GPE
-magnetic
-electrostatic
-nuclear

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2
Q

Principle of conservation of energy

A

The total amount of energy in a closed system is constant. Energy cannot be created or destroyed, only converted from one form to another

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3
Q

Energy transfer examples

A

Kettle - electrostatic —> thermal
Log fire - chemical —> thermal
Kicking a ball - KE —> GPE

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4
Q

Dissipation of energy

A

Spreading out into the surroundings (eg. Fiction - dissipation of energy from heat)

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5
Q

Reducing energy dissipation

A

Lubrication - reduces friction
Wheels - reduce friction
Streamlining - reduces air resistance
Thermal insulation - reduces rate thermal energy to lost to surroundings
Low resistance cables - less energy dissipated as heat

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6
Q

Energy efficiency

A

Energy efficiency = useful output energy / total input energy

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7
Q

Thermal insulation - housing

A

-felt loft installation
-cavity wall insulation
-carpets
-double/ triple glazed windows

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8
Q

Materials as thermal conductors practical

A

Independent variable - insulation (eg. Black paper, foil)
Dependant variable - temperature decrease
Control variables - initial temperature, volume of water

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