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 ...
AQA A Level Physics复习笔记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 ...
AQA A Level Physics复习笔记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...
AQA A Level Physics复习笔记7.9.4 Faraday's & Lenz's Laws
Faraday's & Lenz's Laws Faraday's Law links the rate of change of flux linkage with e.m.f It is defined as: The magnitude of the induced e.m.f is directly proportional to the rate of cha...
AQA A Level Physics复习笔记7.9.3 Principles of Electromagnetic Induction
Principles of Electromagnetic Induction 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 cut...
AQA A Level Physics复习笔记7.9.2 Magnetic Flux Linkage
Magnetic Flux Linkage More coils in a wire mean a larger e.m.f is induced The magnetic flux linkage is a quantity commonly used for solenoids which are made of N turns of wire The flux linka...
