Edexcel A Level Physics:復習筆記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:復習筆記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:復習筆記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:復習筆記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...
美國Top 10大學專業排名發布，附對應AP科目和院校推薦
在大學里，同學們可以根據自己的興趣找到一個符合自己理想職業道路的專業。哪些大學專業更受歡迎？畢業后更有前途？都是大家非常關注的問題。 普林斯頓評論根據對就業前景、校友薪水和受歡迎程度的調查，編撰了這...
Edexcel A Level Physics:復習筆記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:復習筆記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:復習筆記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:復習筆記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...
