AQA Energy Flashcards
A system is defined as
An object or group of objects which are not affected by external energy transfers or forces
Energy can be stored as (6)
GPE, Chemical, EPE, Thermal, Kinetic, Nuclear Energy
Energy can be transferred as (4)
Heating,mechanically,electrically,radiation
GPE increases when
Height increases
Kinetic energy increases when
Speed increases
Another way of saying energy has been transferred
Work done
The units of energy are
Joules
The units of mass are
Kg
The units of speed are
m/s
Power is
The rate of energy transfer
The units of power are
Watts (Joules Per Second
An energy transfer of one joule per second is equal to?
A power of one watt
Energy can be transferred or wasted but never
Created or destroyed
The units of specific heat capacity are
Joules per kilogram degree celsius
Specific heat capacity is
The energy required to raise the temperature of 1kg of a substance by 1°c
Efficiency is
A measure of how much energy is transferred usefully by a device compared to how much energy is input
Dissipated means
Transferred to a less useful store
Fossil fuels are (3)
Coal oil and gas
Renewable means
The resource can be replenished as it’s used
Non renewable means
There is only a finite supply of the resource (we will run out)
Renewable energy sources are (6)
(Name like 3 don’t need all)
Wind, Hydro electricity, geothermal, tidal, Solar (sun), water waves, biofuel
Non renewable energy sources are (2)
Fossil fuels and nuclear
When burnt, fossil fuels release
Greenhouse gases (e.g Co2)
An unreliable energy source means
It won’t always generate electricity (wind turbines won’t work without wind)
Unwanted energy transfers can be reduced by
Insulation/ lubricant
The higher the thermal conductivity of a material
The higher the rate of energy transfer by conduction across the board
In the specific heat capacity required practical, the dependent variable was
The temperature of the block
In the specific heat capacity required practical, the independent variable was
The energy transferred to the block
In the specific heat capacity required practical the hazard and risk was
The hot heater, which may have caused a burn if touched
What measures temperature of a block
Thermometer
What measures the current in a circuit
Ammeter
What measures the voltage
Voltmeter
What energy store is this:
The energy stored in chemical bonds, such as those between molecules
Chemical
What energy store is this:
When an object is stretched or squashed but can return to its original shape
Elastic Potential
What energy store is this:
The faster an object, the more energy it has in its … store
Kinetic
What energy store is this:
An object gains more energy in its … store when it is raised up
Gravitational potential
What energy store is this:
An object will have more energy in its … energy store if the temperature is increased
Thermal
What energy store is this:
The energy stored in the nucleus of an atom
Nuclear
What energy store is this:
The energy stored when repelling poles of magnets have been pushed closer together or when attracting poles have been pulled further apart
Magnetic
What energy store is this:
The energy stored when repelling charges have been moved closer together or when attracting charges have been pulled further apart
Electrostatic
If a material has a high thermal conductivity
Energy is transferred through it quickly
This is a reminder to do the energy resources stuff okay Aydan do it stop slacking okay you want to do triple science
