CIE A Level Physics复习笔记21.1.3 Mean Power
Mean Power In mains electricity, current and voltage are varying all the time This also means the power varies constantly, recall the equations for power: Where: I = direct current (A) V = direct...
CIE A Level Physics复习笔记21.1.2 Root-Mean-Square Current & Voltage
Root-Mean-Square Current & Voltage Root-mean-square (r.m.s) values of current, or voltage, are a useful way of comparing a.c current, or voltage, to its equivalent direct current, or voltage Th...
CIE A Level Physics复习笔记21.1.1 Alternating Current & Voltage
Properties of Alternating Current & Voltage An alternating current (a.c) is defined as: A current which periodically varies from positive to negative and changes its magnitude continuously with...
CIE A Level Physics复习笔记20.2.4 Faraday's & Lenz's Laws
Faraday's & Lenz's Laws Faraday’s law tells us the magnitude of the induced e.m.f in electromagnetic induction and is defined as: The magnitude of the induced e.m.f is directly proportional to ...
CIE A Level Physics复习笔记20.2.3 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 cuts throu...
CIE A Level Physics复习笔记20.2.2 Magnetic Flux Linkage
Magnetic Flux Linkage The magnetic flux linkage is a quantity commonly used for solenoids which are made of N turns of wire Magnetic flux linkage is defined as: The product of the magnetic flux and...
CIE A Level Physics复习笔记20.2.1 Magnetic Flux
Magnetic Flux Definition Electromagnetic induction is when an e.m.f is induced in a closed circuit conductor due to it moving through a magnetic field This happens when a conductor cuts through mag...
CIE A Level Physics复习笔记20.1.11 Forces between Current-Carrying Conductors
Origin of the Forces Between Current-Carrying Conductors A current carrying conductor, such as a wire, produces a magnetic field around it The direction of the field depends on the direction of the...
CIE A Level Physics复习笔记20.1.10 Magnetic Fields in Wires, Coils & Solenoids
Magnetic Fields in Wires, Coils & Solenoids Magnetic field patterns are not only observed around bar magnets, magnetic fields are formed wherever current is flowing, such as in: Long straight w...
