Energy Flashcards
What ar the main stores of energy ?
Magnetism
Thermal
Chemical
Kinetic
Electrostatic
Elastic
Gravitational potential
Nuclear
What are the 4 energy transfers ?
Force
Electricity
Thermal
Radiation
What are energy flow diagrams used for ?
Diagrams can be used to show how energy is transferred from one store to another
What is energy dissipation ?
Whenever there is a change in a system, energy is transferred and some of that energy is dissipated
What can energy be and not be ?
Can be transferred, stored and dissipated
Can not be destroyed
What is work done ?
When a force is acting on a body
What is power measured in ?
Watts
What is work done measured ?
Joules
what is efficiency ?
Whenever there is a change in a system, energy is transferred and some of that energy is dissipated
What will a very efficient device not do ?
A very efficient device will waste very little of its input energy
What will Very inefficient device do ?
A very inefficient device will waste most of its input energy
What are good conductors ?
Metals
What type of metals are good conductors ?
Aluminium
Copper
Steel
What does heat act on ions in metal ?
Make them move faster this means energy is transferred fast as they are close together
What are ways of keeping a house warm ?
Double paned windows
Insulation in walls and roof
what’s the steps to the insulation practical ?
- Place a small beaker into a larger beaker.
- Fill the small beaker with hot water from a kettle.
- Put a piece of cardboard over the beakers as a lid. The lid should have a hole.
- Place a thermometer into the smaller beaker through the hole.
- Record the temperature of the water in the small beaker and start the stopwatch.
- Record the temperature of the water
- Repeat steps 1-6, each time
- Plot a graph of temperature (y-axis) against time (x-axis).
What are factors that depend on how a material changes temperature ?
Mass
Substance
The bp and mp
What are the steps to the specific heat capacity practical ?
- Place the immersion heater into the central hole at the top of the block.
- Place the thermometer into the smaller hole
- Fully insulate the block by wrapping it loosely with cotton wool.
- Record the temperature of the block.
- Connect the heater to the power supply
- After ten minutes the temperature will still rise even though the heater has been turned off and then it will begin to cool.
What is specific heat capacity ?
the energy required to raise 1kg of the material by 1°C.
What are the main energy resources ?
Fossil fuels
Nuclear
Hydroelectric
Geothermal
Wind
Solar power
Whats energy needed for ?
Homes
Public services
Factories
Transport
What is renewable recource ?
Can be reused or renewed
Whats a non renewable recource ?
Cannot be reused or renewed
