efficiency

• their are seven strores of energy kenetic,thermal,elastic,magnetic,chemical,electrostatic,gravitational potential
• power =energy/time
• efficiency caculation=useful energy transfered/total energy supplied x100 percent
• convection is done in fluids or gases
• conduction is the transfer of heat through solids
• convection: the transfer of heat by the movement of hot and cold air as the water is heated it looses density and rise. As the water rizez it pushes cooler water out the way. this makes the cooler water sink to the bottom o be heated up
• black is good at absorbing and emitting radiation
• white is bad at absorbing and emitting radiation
• the objects do not need to touch in radiation
• if 25 joules are yoused for light and 75 is yyoused or heat then the efficiency is 25%
• an insulating material doesn't let heat out
• the amount of internal energy stored depends on its temperature, the material and its mass