# energy

name all the energy stores
- Kinetic - Nuclear - Chemical - Gravitational - Elastic - Magnetic - Thermal electrostatic
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name all the energy pathways
- Mechanical - Electrical - Radiation sound
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what is the principle of conservation of energy
energy can not be created of destroyed
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what is the equation for calculating kinetic energy + units
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what is the equation for calculation elastic potential energy + units
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what is the equation for calculating gravitational potential energy + units
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what is the equation for calculating work + units
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what is work?
A force does work on an object when the force causes the object to move, in the direction of the force.
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what is power?
Power is the rate at which work is done.
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what is the equation for calculating power + units
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what is the equation to calculate change in thermal energy + units
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give an example of reduction of dissipation of energy
Generators can dissipate energy by heating or unwanted mechanical vibrations so Engineers design the generators on the power station to reduce the amount of waste energy in the power station
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give an example on a way to conserve energy within your home
A thin pane of glass in a window transfers energy out the house. We use double glazing to reduce energy loss through the windows. A layer of gas between two panes of glass provides good insulation.
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1. thickness of walls 2. temperature difference between inside and outside of house 3. thermal conductivity of walls 4. area of walls
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what equaton can you use to calculate efficiency?
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what is efficiency?
Efficiency is a way of expressing the proportion of energy that is usefully transferred in a process as a number. The most efficient machines transfer the highest proportions of input energy to useful output energy.
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how does this crane improve efficiency?
as there are 4 wheels it multiplies the force he exerts y for so makes his 250N exerted 1000N increasing his efficienc as he isnt putting in much inpout but is getting allot of output.
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name a positive and negative of usng nuclear power
Nuclear power has the advantage of producing no pollutant gases but we need to be careful where we store nuclear waste
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name a positive and negative of usng biomass
Much of the waste is wood so this is a renewable energy resource. // Biofuels emit carbon dioxide when they are burnt. However, the plants used co2 as they grew so overall biofuels do not add to the amount of co2 in the atmosphere: carbon neutral
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name a positive and negative of usng tidal power
generates allot of power but forests have been cut down people have lost their homes farmland is lost and wildlife habitat is destroyed
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name a positive and negative of usng wind power
Wind power is good as it is clean so there are no waste products. However, wind power is unreliable as if wind is too light not enough power is generated and if the wind is too strong, generators can overheat.
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name a positive and negative of usng solar power
In some countries solar electricity is unreliable due to the weather, but it can still make a useful contribution to a country's overall power supply.
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name a positive and negative of usng geothermal energy
A small number of countries are able to make good use of geothermal energy to generate electricity. but it is good as its clean and renewable.
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## Other cards in this set

### Card 2

#### Front

name all the energy pathways

#### Back

- Mechanical - Electrical - Radiation sound

### Card 3

#### Front

what is the principle of conservation of energy

### Card 4

#### Front

what is the equation for calculating kinetic energy + units

### Card 5

#### Front

what is the equation for calculation elastic potential energy + units