CIE A Level Physics复习笔记22.1.2 The Electronvolt
The Electronvolt The electronvolt is a unit which is commonly used to express very small energies This is because quantum energies tend to be much smaller than 1 Joule The electronvolt is derived f...
CIE A Level Physics复习笔记22.1.1 The Photon
The Particle Nature of Light In classical wave theory, electromagnetic (EM) radiation is assumed to behave as a wave This is demonstrated by the fact EM radiation exhibits phenomena such as diffrac...
CIE A Level Physics复习笔记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复习笔记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...
