A-Level经济和商务有何不同，应该如何选？
A-Level 商务（Business Management）和A-Level 经济（Economy）都是商科方向的课程。于是有很多学生会在选课阶段对着两门课程纠结不已，不知道究竟该选择哪门课程。事实上，虽然A-Level 商务（Business Manageme...
Edexcel A Level Physics:复习笔记3.11 Current & Drift Velocity
Calculating Current & Drift Velocity Drift Velocity In a conductor, the current is due to the movement of charge carriers The charge carriers can be negative or positive However current ...
Edexcel A Level Physics:复习笔记3.10 Core Practical 2: Investigating Resistivity
Core Practical 2: Investigating Resistivity Aims of the Experiment The aim of the experiment is to determine the resistivity of a length of wire Variables Independent variable = Length, L, of the w...
Edexcel A Level Physics:复习笔记3.9 Electrical Resistivity
Electrical Resistivity All materials have some resistance to the flow of charge As free electrons move through a metal wire, they collide with ions which get in their way As a result, they t...
Edexcel A Level Physics:复习笔记3.8 Current-Potential Difference Graphs
Current-Potential Difference Graphs As the potential difference (voltage) across a component is increased, the current also increases (by Ohm’s law) The precise relationship between voltage ...
Edexcel A Level Physics:复习笔记3.7 Electrical Power
Electrical Power Work is also defined as a transfer of energy When components transfer electrical energy to other stores, work must be done because energy is transferred Therefore, potential differ...
Edexcel A Level Physics:复习笔记3.6 Resistance in Series & Parallel
Deriving Equations for Resistance in Series & Parallel Resistors In Series When two or more components are connected in series: The combined resistance of the components is equal to the sum of ...
Edexcel A Level Physics:复习笔记3.5 Energy Conservation in Circuits
Energy Conservation in Circuits The Electrical Voltages Rule (Kirchhoff's Second Law) Energy is never used up or lost in a circuit, since everything follows the Law of Conservation of Energy The el...
Edexcel A Level Physics:复习笔记3.4 Charge Conservation in Circuits
Charge Conservation in Circuits The Electric Current Rule (Kirchhoff's First Law) The electric current rule is defined as: The algebraic sum of the currents entering and leaving a junction is equal...
