P1: Energy Flashcards
What is the law of conservation of energy?
No energy is created or destroyed but it is transferred
What is the gravitational potential energy?
The energy gained when raising an object above ground
Weight(N/kg)= mass(kg) x gravitational field (N) x height
Elastic potential energy
1/2 x spring constant(N/m) x extension(squared)(m)
Work done:
Work done (j) = force(N) x distance
W= Fx s
Efficiency
Efficiency= useful output / total input x100
Energy resources(8):
Geothermal= renewable. Solar= renewable. Tidal= renewable. Hydroelectricity= renewable. Fossil fuels= non-renewable Nuclear= non-renewable biofuels= renewable. Wind =renewable
Kinetic energy:
1/2 x mass(kg) x velocity (squared)(m/s)
Er= 1/2 x m x v^2
Insulating a building(2)
- Insulation reduces the amount of energy transfer by conduction.
- The lower the thermal conductivity of the insulating material and the thicker the layer the more the rate of energy transfer is reduced.
Dissipation(definition):
When energy is given out to the surroundings
Energy store(definition):
The capture of energy produced at one time for use at a later time
Energy transfer(definition):
The conservation to one type of energy to another form
Density:
Mass/volume
P=m/v
What are biofuels?
Energy resources made by burning plants and also animal waste
Mechanical energy transfer:
To do with movement
What is an environmental problem caused by generating electricity using hydro-electro power?
It could result in a loss of habitat for some species
