Edexcel A Level Physics:复习笔记8.1 Nucleon & Proton Number
Nucleon & Proton Number Atomic symbols are written in a specific notation as shown below: Atomic symbols show the proton number and nucleon number The top number A represents the nucleon...
Edexcel A Level Physics:复习笔记7.22 Root-Mean-Square Current & Potential Difference
Root-Mean-Square Current & Potential Difference The root-mean-square (rms) current Irms is defined by the equation: Where: I0 = peak current (A) The rms voltage Vrms is defined by the eq...
Edexcel A Level Physics:复习笔记7.21 Alternating Currents & Potential Differences
Alternating Currents & Potential Differences An alternating current (a.c) is defined as: A current which periodically varies between a positive and negative value This means the direction of an...
Edexcel A Level Physics:复习笔记7.20 Faraday's Law
Faraday's Law Faraday's Law connects the rate of change of flux linkage with induced e.m.f It is defined in words as: The magnitude of the induced e.m.f is directly proportional to the rate of chan...
美国Top 10大学专业排名发布，附对应AP科目和院校推荐
在大学里，同学们可以根据自己的兴趣找到一个符合自己理想职业道路的专业。哪些大学专业更受欢迎？毕业后更有前途？都是大家非常关注的问题。 普林斯顿评论根据对就业前景、校友薪水和受欢迎程度的调查，编撰了这...
Edexcel A Level Physics:复习笔记7.19 Lenz's Law
Lenz's Law Lenz’s Law is used to predict the direction of an induced e.m.f in a coil or wire Lenz's Law is summarised below: The induced e.m.f is set up in a direction to produce effects that oppos...
Edexcel A Level Physics:复习笔记7.18 Induced E.M.F between Linked Coils
Induced E.M.F between Linked Coils An e.m.f can be induced in a coil when there is a change of current in another coil linked with this coil This is what happens in a transformer Transformers A tra...
Edexcel A Level Physics:复习笔记7.17 Induced E.M.F in a Moving Coil
Induced E.M.F in a Moving Coil Electromagnetic induction is a phenomenon which occurs when an e.m.f is induced when a conductor moves through a magnetic field If there is a change in magnetic flux ...
Edexcel A Level Physics:复习笔记7.16 Magnetic Force on a Current-Carrying Conductor
Magnetic Force on a Current-Carrying Conductor A current-carrying conductor produces its own magnetic field An external magnetic field will therefore exert a magnetic force on it A current-c...
