Energy Flashcards
(28 cards)
What is the equation of Gravitational Potential Energy?
Mass x gravitational field strength x height
What is the equation of kinetic energy?
1/2 x mass x velocity2
Explain what is meant by the conservation of energy
Total energy before is equal to total energy after a transfer. Energy cannot be created or destroyed.
What is the energy transfer when an object is thrown vertically upwards
Kinetic to Gravitational
What is the energy transfer when a moving object collides with an obstacle coming to a stop?
Kinetic into Heat and Sound
What is the energy transfer when a falling mass accelerates the trolley?
Gravitational and Kinetic (and heat and sound)
What is the energy transfer when boiling a kettle?
Electrical into Heat (and sound)
What is the main form of wasted energy?
Heating of the surroundings
Explain ways of reducing unwanted energy
Lubrication and insulation
Describe the effects of the thickness and thermal conductivity of the walls of a building on its rate of cooling.
The thicker the wall and the better the insulation the less the building will cool.
What is meant by a renewable energy resource?
Will not run out
What is meant by a non-renewable energy resource?
Will run out
Explain the 5 main stages of a fossil fuel power station
1) Burn the fuel to produce heat
2) Boil water to produce steam
3) The steam then turns the turbines
4) Turbines then turns the generators
5) generators then produce electricity
What is the name of the process that produces heat in a nuclear power station?
Nuclear Fission
What is the main environmental effect of using fossil fuels?
CO2 leads to climate change
What is the main environmental effect of Nuclear Power?
Nuclear waste is extremely hazardous and must be stored very carefully
What is the main disadvantage of wind, solar and wave energy resources
Un reliable- will only produce energy when the weather allows it
Which renewable energy resources can respond to demand?
Geo-thermal
Hydro electric
Tidal
What are the 8 different types of energy
Kinetic Thermal Chemical Gravitational Potential Elastic Potential Electrostatic Magnetic Nuclear
What are the 4 ways in which energy can be transferred between stores?
Mechanically
Electrically
By heating
By radiation
What is efficiency?
Energy is only useful when it is transferred from one store to a useful store
How can you calculate efficiency?
Useful energy/ total energy
What is lubrication?
It reduces energy transferred by friction
What is insulation?
Insulation reduces the rate of energy transfer by heating
