Physics Revision - Energy

Questão	Responda
Energy is a measure of...	..what an object can do
It is measured in..	..Joules (J)
Energy can be roughly divided into 10 types:	Light , gravitational potential) Thermal (moving heat) Internal (warmth) sound , chemical potential (from chemical reactions) , nuclear potential (from nuclear reactions) elastic potential (from stretching) electrical potential kinetic (moving objects)
The law of conservation of Energy is..	Energy cannot be made, created or destroyed Energy can only be transformed from one type to another
input energy =	output energy
Sometimes numbers are included ; electrical (100J) = light (75J) and thermal ....	...(25J)
Energy is ...	.... a measure of what an object can do
Energy is transferred...	...from one type to another
Energy cannot be ...	...created or destroyed
Work done, or work is ...	... a measure of energy
As it is energy, the unit is..	...joules (J)
Work done calculates ...	...how much energy is needed to move an object a distance (with a force)
work done = E=	force x distance F x d
The force is measured in ..	..newtons (N)
... and the distance in...	metres (m)
Force is measured using a ...	... newtonmetre
Distance is measured using a ...	... ruler
Power calculates ..	the rate at which energy is delivered
power = P=	energy / time E/t
The unit of power is ...	... watts (W)
An energy resource is...	...something that can produce heat, power life, move objects, or produce electricity
Renewable energy is...	... from an energy resource that will not run out. More of it is continuously made faster than we use it.
Non-renewable energy is...	...from an energy resource that is used faster than more of the energy resource can be formed. One day the resource will run out.
Fossil fuels are formed from....	plants and/or animals
....That have died a long time ago and have been exposed to high....	heat and pressure
...Under the Earth's crust for...	hundred's of millions of years
Two main reasons we are using fossil fuels less are:	-they are non-renewable meaning one day we shall run out of them -they produce carbon dioxide when burnt. This gas contributes to global warming.
Coal is a solid fuel it is burnt in power stations converting .......... potential energy into thermal.	.. chemical ...
....This then boils water, which turns to ...	steam
......The steam turns a turbine, which turns a generator, producing ............ energy.	electrical
Some advantages of using coal are: (3)	-It is cheaper to build and run (cheap fuel) -Abundant (available when needed) -Can be found almost anywhere
Some disadvantages of using coal are: (4)	-Nonrenewable (around 150 years left) -Cost will increase over time -Produces carbon dioxide when burnt -Produces sulphur dioxide which causes acid rain
Oil is a liquid fuel. It is burnt in power stations, converting .................. potential energy into thermal energy.	chemical
This then boils water, which turns to ...........	steam
The steam turns a turbine, which turns a ......................., producing electrical energy.	generator
Advantages of using Oil: (4)	-Cheaper to build and run (cheap fuel) -abundant ( available when needed) -can be found almost anywhere -produces less sulphur dioxide
Disadvantages of using oil: (3)	-nonrenewable (around 53 years left) -cost will increase over time. -produces greenhouse gases when burnt
Natural gas is a ..................	gas fuel
It is burnt in power stations, converting chemical potential energy into .................... energy.	thermal
This then ................... water, which turns to steam.	boils
This steam turns a ............................, which turns a generator, producing electrical energy.	turbine
Advantages of using gas: (4)	-Cheaper to build and ran (cheap fuel) -abundant (available when needed) -can be found almost anywhere. -Produces less sulphur dioxide.
Disadvantages of using gas: (4)	-Nonrenewable (about 75 years left) -Cost will increase over time -Produces Carbon Dioxide when burnt. -Produces sulphur dioxide which causes acid rain

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Physics Revision - Energy

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	Criado por Martha Simpkins mais de 5 anos atrás