AQA A Level Physics复习笔记8.1.1 Rutherford Scattering
Rutherford Scattering Evidence for the structure of the atom was discovered by Ernest Rutherford in the beginning of the 20th century from the study of α-particle scattering The experimental...
AQA A Level Physics复习笔记7.10.5 Transformer Inefficiencies
Inefficiencies in a Transformer Inefficiencies in a transformer appear not from just the core, but also in the wires The coils of wire have resistance This causes heat energy to be lost from...
AQA A Level Physics复习笔记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复习笔记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复习笔记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复习笔记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复习笔记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...
Edexcel IGCSE Chemistry 复习笔记 1.6 5 Ionic compounds: Bonds, Structure & Properties
Edexcel IGCSE Chemistry 复习笔记 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 复习笔记 1.6 4 Ionic Bonds: Dot & Cross Diagrams
Edexcel IGCSE Chemistry 复习笔记 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...
