AQA A Level Physics復(fù)習(xí)筆記7.10.4 Transformer Efficiency
Transformer Efficiency In reality, transformers are not 100% energy efficient This means their power output is less than the power input For an ideal (100% efficient) transformer, the...
AQA A Level Physics復(fù)習(xí)筆記7.10.3 The Operation of a Transformer
The Transformer Equation 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 reduce ...
AQA A Level Physics復(fù)習(xí)筆記7.10.2 The Operation of an Oscilloscope
Oscilloscope as a DC & AC Voltmeter A Cathode-Ray Oscilloscope (CRO) is a laboratory instrument used to display, measure and analyse waveforms of electrical circuits It can therefore be used as...
AQA A Level Physics復(fù)習(xí)筆記7.10.1 Alternating Current & Voltage
Sinusoidal & Root-Mean-Square Current & Voltage An alternating current (a.c) is defined as: A current which periodically varies between a positive to a negative value with time This ...
IB DP Maths: AA HL復(fù)習(xí)筆記4.6.1 The Normal Distribution
What is a continuous random variable? A continuous random variable (often abbreviated to CRV) is a random variable that can take?any value?within a range of infinite values Continuous random variab...
美國頂尖大學(xué)學(xué)費又漲價了！兩所美國頂尖院校宣布向國際生實行Need-Blind招生政策
隨著美國疫情的常態(tài)化，有些院校不光恢復(fù)了線下教學(xué)，還漲了學(xué)費。相信大家前段時間都聽說了：美國頂尖大學(xué)的學(xué)費又漲了！ 據(jù)悉，美國排名前30的大學(xué)中有27所正在提高下一學(xué)年的學(xué)雜費。而自2019-2020學(xué)年以來，...
Edexcel IGCSE Chemistry 復(fù)習(xí)筆記 1.6 5 Ionic compounds: Bonds, Structure & Properties
Edexcel IGCSE Chemistry 復(fù)習(xí)筆記 1.6 5 Ionic compounds: Bonds, Structure & Properties Ionic bonding The positive and negative charges are held together by the strong?electrostatic forces...
Edexcel IGCSE Chemistry 復(fù)習(xí)筆記 1.6 4 Ionic Bonds: Dot & Cross Diagrams
Edexcel IGCSE Chemistry 復(fù)習(xí)筆記 1.6 4 Ionic Bonds: Dot & Cross Diagrams Ionic Bonds: Dot & Cross Diagrams Deducing Dot & Cross Diagrams for Ionic Compounds Sodium is a group 1 metal so...
Edexcel IGCSE Chemistry 復(fù)習(xí)筆記 1.6.3 Formulae for Ionic Compounds
Edexcel IGCSE Chemistry 復(fù)習(xí)筆記 1.6.3 Formulae for Ionic Compounds Formulae for Ionic Compounds The formulae of simple ionic compounds can be calculated if you know the charge on the ions B...
AQA A Level Physics復(fù)習(xí)筆記7.9.6 Required Practical: Investigating Flux Linkage on a Search Coil
Required Practical: Investigating Flux Linkage on a Search Coil Aims of the Experiment The overall aim of this experiment is to determine how the magnetic flux linkage varies?with the angle ...
Edexcel IGCSE Chemistry 復(fù)習(xí)筆記 1.6.2 Common Ions
Edexcel IGCSE Chemistry 復(fù)習(xí)筆記 1.6.2 Common Ions Common Ions How to deduce the charge of an ion Find the number of electrons in the outer electron shell Find out if it is easy for the atom...
AQA A Level Physics復(fù)習(xí)筆記7.9.5 Applications of EM Induction
Moving Conductors in a Magnetic Field Similar to a coil or a solenoid, a straight conducting rod moving through a magnetic field will also have an e.m.f induced in it This is only when the c...
