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Physics (Conservation and Dissipation of Energy (Energy and Power (The…
Physics
Conservation and Dissipation of Energy
Changes In Energy Stores
Energy stores
Chemical
Thermal
Light
Nuclear
Sound
Kinetic
Electrical
GPE
Elastic Potential
Energy can be transferred from one store to another through processes. E.G in a torch the chemical energy from the energy is transferred by electrical to light and heat
BATTERY
chemical store
LAMP
electrical store
SURROUNDINGS
SURROUNDINGS
Conservation Of Energy
Energy cannot be created or destroyed only transferred
Energy and Work
When an object is moved by a force
work
is done on the object by the force
Energy Transferred = Work Done
Work = force applied x distance
GPE Stores
Change in Objects GPE = weight x change in height
Change in GPE store = mass x change in height x gravitational field strength
Energy Dissipation
Useful Energy
Energy which is directed in the way in which is useful. E.G a torch useful energy is light
Wasted Energy
Energy which is wasted and isn't useful. E.G a torch the wasted energy is the heat
Dissipated Energy
the rest of the energy that is not used in a useful way and so is stored in less useful way
Energy and Power
The energy that you supply to a motor every second is the power
The more powerful the lift motor is the faster it lifts a certain object
Power = energy transferred / time taken
efficiency = (useful energy output / total power input) x 100
Energy Transfer By Heating
Energy Transfer By convection
Insulator
A material that traps heat and does not transfer it on very easily
Conductor
These are very good at transferring heat energy withing them
Energy transfer through radiation
There are many types of radiation from natural sources. Radiation is the movement of heat through gases or without particless all to gether
UV radiation is poverfull radiation sent from our sun, it is high in power and is what causes your skin to tan and eventually burn if exposed for too long.
Infra red radiation is also emitted fromantic our sun. It is much longer in wavelengta than UV light . This form of radiation is what causes the warmth of he sun on our skin
All of jets five of one form of infrared radiation, no matter how hot or cold they are. Special cameras can detect this radiatiob being emitted by these objects
There are objects that reflect and transfer no formal of radiation. These are called perfect Black Bodies.
Electrical Transfer -->
Light transfer -->
Heat transfer -->