美國數學競賽amc比賽時間2022公布，還有時間準備!
每年都有30多萬學生參加，AMC什么來源？AMC屬于數學學術活動，參與量大，在競爭中取得優異的成績不僅可以作為數學方向的額外分數，而且在申請科學、工程、經濟和商業方面也有一定的作用。這是學生改善背景的最佳...
IB DP Physics: HL復習筆記11.2.6 Diode Bridges
Diode Bridges Most electronic devices cannot use alternating current, they require direct current instead This is possible by use of a?rectifier Rectifiers convert alternating current (ac) to direc...
IB DP Physics: HL復習筆記11.2.5 AC Electrical Power Distribution
AC Electrical Power Distribution Energy losses due to the heating of transmission lines in national power grids are?significant This is because the electrical energy is transmitted across long dist...
IB DP Physics: HL復習筆記11.2.4 Transformer Calculations
Transformer Calculations The transformer equation is: Where: Ns?= number of turns in the secondary coil Np?= number of turns in the primary coil εs?= output voltage from the secondary coil (V) εp?=...
被牛津劍橋錄取學生參加什么競賽項目？
無論是英國牛劍還是美國藤校，科研學術活動都是招生官審核和面試的重要組成部分，也是申請人能否獲得學校offer關鍵參考因素。被牛津劍橋錄取學生參加什么學術活動項目？簡單來說，參加學科學術活動可以幫助你在學...
IB DP Physics: HL復習筆記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復習筆記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復習筆記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復習筆記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復習筆記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復習筆記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復習筆記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...
