Energy Flashcards
What does it mean when an energy is transferred usefully?
Energy that is transferred usefully is transferred into the store that you wanted to go to
Why is this dissipated is energy described as wasted
Dissipated energy is sometimes be described as we said because the energy has been transferred into stores that are not useful
In a close system, what is the effect of energy transfers on the total energy of the system?
In a closed system energy transfers have no effect on the total energy of the system and example of this is a cold spoon being dropped into an insulated flask containing hot liquid. Once the flask is sealed, flask the liquid on the spoon form a closed system. Energy is transferred by heating from the thermal store of the liquid to the thermal energy store of the spoon.
What does it mean If a machine is powerful
A powerful machine is a machine that can transfer a lot of energy in a short space of time
Describe how the cooling rate of a building relates to the thickness of its wall
The thick of the walls of the building, the slower the building will cool
What experiment can Kate do to investigate house thickness of bubble wrap affects how good thermal insulator is
Parramatta boiling water into a bigger wrapped in one layer of bubble wrap
Place the lid on the beaker and insert a thermometer through a small hole in the lid. When the water reaches a certain value, start a timer after a set amount of times, measure the temperature change. Repeat with different layers.
Name three main fossil fuels
Call oil and natural gas
Name, renewable energy sources
The Sun, wind, water waves, hydroelectricity, biofuel, tides, geothermal
Compare the advantages and disadvantages of renewable and non-renewable
ADVANTAGES
-renewable energy sources never run out
-They do less damage to the environment
DISADVANTAGES
-Renewable energy resources tend not to provide as much energy and can’t be less reliable as they often depend on the weather
What material can make biofuels?
Plant products or animal poo
Geothermal energy can be used to heat water. State the energy stores that energy is transferred from onto when harnessing geothermal energy.
Energy is transferred from thermal store of the Underground rocks to the thermal energy store of the water
Is hydroelectric power, reliable
It is reliable, except in times of drought. Water can be allowed through to Barns to provide an immediate response to demand for electricity
How come hydroelectric power impact the environment
It requires flooding of the valley rotor vegetation that emit greenhouse gases and The destruct habitats
Why are fossil fuels currently reliable?
They can be extracted from the Earth at a fast enough rate, the power plants always have enough fuel in stock to meet them demand.
However, they are slowly running out, so in the future, they will be harder to obtain
Advantages of nuclear power
ADV
-MORE ENVIRONMENTALLY FRIENDLY
-Doesn’t directly a myth, sulphur dioxide, a greenhouse gases
DISADV
-Nuclear waste produced is dangerous and difficult to dispose
Risk of nuclear catastrophe