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A-Level（General Certificate of Education Advanced Level ），英国高中课程，是英国全民课程体系，是英国普通中等教育证书考试高级水平课程，也是英国学生的大学入学考试课程。 A-Level科目的受欢迎度在一定程...
Edexcel A Level Physics:复习笔记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:复习笔记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:复习笔记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:复习笔记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:复习笔记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...
