被牛津剑桥录取学生参加什么竞赛项目？
无论是英国牛剑还是美国藤校，科研学术活动都是招生官审核和面试的重要组成部分，也是申请人能否获得学校offer关键参考因素。被牛津剑桥录取学生参加什么学术活动项目？简单来说，参加学科学术活动可以帮助你在学...
IB DP Physics: HL复习笔记11.2.3 Step-Up & Step-Down Transformers
Step-Up & Step-Down Transformers A transformer is A device that changes high alternating voltage at low current to low alternating voltage at high current, and vice versa This is designed to re...
IB DP Physics: HL复习笔记11.2.2 Root-Mean-Square Current & Voltage
Root-Mean-Square Current & Voltage Direct current sources provide a constant voltage and current over time, making it easy to measure In situations involving alternating voltage and current, th...
IB DP Physics: HL复习笔记11.2.1 AC Generators
AC Generators If a coil of wire is rotated inside a magnetic field by an external force, an emf will be generated in the wire which causes current to flow within the coil The generator effect can b...
IB DP Physics: HL复习笔记11.1.4 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...
IB DP Physics: HL复习笔记11.1.2 Induced Emf
Induced Emf Electromagnetic induction is a phenomenon which occurs when an e.m.f. is induced when a conductor moves through a magnetic field When the conductor cuts through the magnetic field lines...
IB DP Physics: HL复习笔记11.1.1 Emf, Magnetic Flux & Magnetic Flux Linkage
Emf, Magnetic Flux & Magnetic Flux Linkage Electromagnetic Induction When a conducting wire moves through a magnetic field, a potential difference is created along the wire If the wire is part ...
IB DP Physics: HL复习笔记10.2.8 Forces on Charges & Masses
Forces on Charges & Masses The electric field strength equation can be rearranged for the force F on a charge Q in an electric field E: Where: F = electrostatic force on the charge (N) Q = char...
IB DP Physics: HL复习笔记10.2.7 Forces & Inverse-Square Law Behaviour
Forces & Inverse-Square Law Behaviour The gravitational force between two bodies outside a uniform field (for example, between the Earth and the Sun) is defined by Newton’s Law of Gravitation w...
