Please enable JavaScript.
Coggle requires JavaScript to display documents.
P1 (Efficiency (most energy transfers waste some energy (you can change…
P1
Efficiency
most energy transfers waste some energy
you can change that by lubricating or insulating objects
useful devices are only useful if they transfer energy from one store from the other
less energy is wasted when a device is more efficient
e=useful output energy/total input energy transfer
you can work out efficiency if you know the power input and output
efficiency useful power output/total power input
specific heat capacity
Different materials have different heat capacities
spc=change/tempxmass
specific heat capacity is the amount of energy required to raise 1kg 1 degrees centigrade
Energy stores
Stores and systems
energy is transferred between stores
there are 8 energy stores
when a system changes energy is transferred
they can be changed by heating or doing work
Kinetic and potential energy
Kinetic energy is increased when an object is moving. it also has energy transferred when an object is moving quickly to its store and out when it slows down
1/2xmxv2
gravitational potential energy is when an object has been lifted and you work out how much energy it takes to get back down to ground
mxgxh