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A-Level（General Certificate of Education Advanced Level ），英國(guó)高中課程，是英國(guó)全民課程體系，是英國(guó)普通中等教育證書(shū)考試高級(jí)水平課程，也是英國(guó)學(xué)生的大學(xué)入學(xué)考試課程。 A-Level科目的受歡迎度在一定程...
Edexcel A Level Physics:復(fù)習(xí)筆記2.22 Efficiency
Efficiency The efficiency of a system is a measure of how well energy is transferred in a system Efficiency is defined as: The ratio of the useful power or energy transfer output from a syst...
Edexcel A Level Physics:復(fù)習(xí)筆記2.21 Power
Power The power of a mechanical process is the?rate at which energy is transferred Since work done is equal to the energy transferred, power can also be defined as the rate of doing work or?the wor...
Edexcel A Level Physics:復(fù)習(xí)筆記2.20 The Principle of Conservation of Energy
The Principle of Conservation of Energy The principle of conservation of energy?is a law of Physics which always applies to a?closed system To apply conservation of energy, heat losses are usually ...
Edexcel A Level Physics:復(fù)習(xí)筆記2.19 Gravitational Potential Energy
Gravitational Potential Energy Gravitational potential energy (usually written Ep, but sometimes GPE) is energy stored in a mass due to its position in a gravitational field If a mass is?lif...
Edexcel A Level Physics:復(fù)習(xí)筆記2.18 Kinetic Energy
Kinetic Energy Kinetic energy (usually written?Ek?and sometimes KE) is the energy an object has due to its?motion?(or velocity) The faster an object moves, the greater its kinetic energy &nb...
