Energy Flashcards

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1
Q

What is a system?

A

A single or a group of objects

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2
Q

What is a closed system?

A

Where neither matter or energy can leave the system

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3
Q

What are the eight types of energy?

A

Thermal, kinetic, gravitational potential, elastic potential, chemical, magnetic, electrostatic and nuclear

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4
Q

What are two ways energy can be transferred?

A

By heating or by doing work

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5
Q

When can work be done?

A

When current flows or by a force moving an object

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6
Q

Why do raised objects store energy in gravitational potential energy stores?

A

Because lifting an object in a gravitational field requires work, which causes a transfer of energy

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7
Q

What happens when an object falls, in terms of energy?

A

Energy from its gravitational potential store is transferred it it’s kinetic energy store. if there’s air resistance, then some of the energy can be transferred to other energy stores

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8
Q

What is specific heat capacity?

A

The amount of energy needed to raise the temperature of 1kg of substance by 1C

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9
Q

What is the conservation of energy principle?

A

Energy can be transferred usefully, stored or dissipated but can never be created or destroyed

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10
Q

What is dissipated energy?

A

Where the energy is being stored in a way that is not useful

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11
Q

What is power?

A

The rate of doing work or the rate of energy transfer

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12
Q

What is conduction?

A

The process where vibrating particles transfer energy to neighbouring particles

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13
Q

What is convection?

A

Where energetic particles move away from hotter to cooler regions

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14
Q

How is a device more efficient?

A

If less input energy transferred to an energy store is wasted

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15
Q

How do you work out efficiency?

A

Useful output energy transfer / total input energy transfer or useful power output / total power input

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16
Q

What are the three main fossil fuels?

A

Coal, oil and natural gas

17
Q

What is a non-renewable energy resource?

A

Resources that will run out one day

18
Q

What are the seven renewable energy resources?

A

Solar, wind, water waves, hydro-electricity, bio-fuel, tides and geothermal

19
Q

What is a renewable energy resource?

A

Resources that will never run out

20
Q

Why are non-renewable sources better than renewable ones?

A

They provide more energy and are more reliable

21
Q

Why are renewable sources better than non-renewable ones?

A

They do less damage to the environment and will never run out