energy Flashcards

Question

how to make sure your house keeps warn

Answer 1

sealed closed - air isn't able to pass out = or it would lose heat energy by convection to do so you add foam seal to your window reduce loss by convection - heat lost directly thought solids - window - wall in order to combat that add thick walls - low thermal conductivity or cavity walls with insulating foam between them - this creates an air gap = reduces convection windows = double glazing = 2 layers of glass and air gap between them so that conduction doesn't occur

Answer 2

you want to reduce it because a lot of friction reduces the efficency of energy transfer you can use lumribants like oil or make transport streamlines

Answer 3

power is the ratae at which energy is transfered p = e/t

Answer 4

power is the rate at which the work is done P= w/t

Answer 5

power is the rate at which the work is done P= w/t

Answer 6

proportion of the energy supply taht is actually useful

Answer 7

efficiency = useful energy output/ total energy input

Answer 8

Wind Solar Geothermal Water waves Biofuels Hydroelectricity Tidal

Answer 9

natural gas

Answer 10

A renewable energy resource is one that is being replenished as quickly as it is used. For example solar energy is renewable because new sunlight is always being generated by the sun - we don't use it up. A non-renewable energy resource on the other hand is one that isn't being replenished and so has a limited supply. For example fossil fuels like coal are non-renewable because they're not being replenished and at some point coal could run out.

Answer 11

A fossil fuel is a hydrocarbon-containing material formed naturally in the earth's crust from the remains of dead plants and animals.

Answer 12

1Relatively cheap 2Can be used in any conditions (e.g. don't require wind or sunshine to work) 3Much of our current infrastructure is designed to run using fossil fuels (e.g. most of our cars use petrol or diesel which are both made from crude oil)

Answer 13

They're a limited resource so will run out one day 2They produce carbon dioxide when burned, which is a greenhouse gas and contributes to global warming 3They sometimes produce toxic gases when burned - such as sulfur dioxide and carbon monoxide

Answer 14

Nuclear fuels do not produce any pollutants like sulfur dioxide, or greenhouse gases like carbon dioxide 2Can be used in any conditions (e.g. nuclear power doesn't depend on environmental forces like sunshine or wind) 3Although nuclear fuel (like uranium) is a limited resource, it is very unlikely to run out for a very long time

Answer 15

Nuclear fuels (like uranium) are technically a finite resource (although nuclear power stations only use very tiny amounts so it won't run out any time soon) 2Nuclear power stations produce radioactive waste, which remains harmful for thousands of years and so must be stored very carefully 3It is quite expensive 4If there is a problem at the power station, there is a very small chance of a nuclear meltdown which could release large amounts of radioactive material into the environment

Answer 16

- low running costs - don't damage the enviroment - cheaper every day

Answer 17

- high upfront cost - making them produces pollutants - dependant on weather - now way to increase supply in times of peak demnad - takes up lots of space

Answer 18

- installing only damages enviroment slightly - running it doen't produce any pollution - renewable - reliable over long periods

Answer 19

- power plants can be expensive to build - only use the source in certain areas

Answer 20

In regions with lots of volcanic activity, the ground is naturally very hot. So when we pump cold water down into the ground it will be heated by the hot rocks. If we pump this hot water back up to the surface we can use it to heat our homes. Alternatively, we let it heat up so much that it evaporates into steam. The steam can then be used to turn a turbine, which in turn can drive a generator to produce electricity.

Answer 21

fuel thta's made from recently living organisms

Answer 22

because in their lifetime plants collect Co2 and when you burn biofuel it realese CO2 so there is no overall vhange

Answer 23

easy to transport cheap to make wecan benefit from them without building new cars a renewableresource

Answer 24

- neeed somewhere to plant all these splants - release loads of Co2 cutting down forest - requires energy for harvesting processing and transporting

Answer 25

In order to grow the biofuels, we often have to clear land by cutting down trees. This means the trees can no longer photosynthesise and absorb CO2 themselves, and will also release large amounts of CO2 if burned. In addition, it usually requires a lot of energy to harvest, process, and transport the biofuels, which itself will produce a lot of CO2

Answer 26

As water flows downhill (e.g. from mountains), a hydroelectric dam will trap the water in a man made lake, which is also known as a reservoir. Then whenever water is released through the dam, it spins turbines which are connected to generators, and so produce electricity. The water can then return to the river on the downstream side of the dam.

Answer 27

Tidal barrages work in a similar way to hydroelectric dams. However, instead of damming water that's flowed down from upstream like a conventional dam, a tidal barrage allows water to flow into a bay or river during high tide, and then releases that water during low tide.

Answer 28

Higher electricity demands can be met by increasing water flow They are a source of renewable energy

Answer 29

Upfront building costs are quite high They can flood land upstream

Answer 30

It is a renewable energy resource and there are no fuel costs No harmful polluting gases are produced

Answer 31

It is difficult to scale up the designs for wave machines to produce large amounts of electricity Having many wave machines can negatively affect wildlife

energy Flashcards

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