CIE A Level Physics復(fù)習筆記21.1.5 Smoothing
Smoothing In?rectification, to produce a steady?direct current? or voltage from an?alternating current??or voltage, a?smoothing capacitor?is necessary Smoothing is defined as: The reduction in the ...
CIE A Level Physics復(fù)習筆記21.1.4 Rectification
Rectification Graphs Rectification is defined as: The process of converting?alternating current??and voltage into?direct current??and voltage Rectification is used in electronic equipment which req...
CIE A Level Physics復(fù)習筆記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復(fù)習筆記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復(fù)習筆記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復(fù)習筆記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復(fù)習筆記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復(fù)習筆記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復(fù)習筆記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復(fù)習筆記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復(fù)習筆記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...
CIE A Level Physics復(fù)習筆記20.1.9 Velocity Selection
Velocity Selection A velocity selector is defined as: A device consisting of perpendicular electric and magnetic fields where charged particles with a specific velocity can be filtered Velocity sel...
