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ELECTRICITY (多余的...额外 (heating element, fuse, energy consumption算电费…
ELECTRICITY
Fundamental 基础
electric field pattern
structure of atom 
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Van de Graaff generator -吸掉(-) 表面是正电，手放下去，(-)被吸走 每根头发都是正电 互相排斥炸起来
electric charge
Q=Ne Q:electric charge(C) N:number of electrons(or protons) e:elementary charge=1.6 x 10^ -19 :warning:
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conductor & insulator
charge distribution on conductor(画electric field lines) 1) surface越小，charge越集中 2) 那些线越密代表electric field越强
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Arrangement of Resistors
potential difference电位差
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electric potential: work done by moving a charge particle from infinity to a point in an electric field is equal to the electric potential at that point.
resistance 电阻
ohm's law:the potential difference across an ohmic conductor is directly proportional to the electric current, provided that its temperature and the other physical factors are kept constant.
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Circuit
electromotive force(e.m.f.): work done by a source in driving a unit charge around a complete circuit.
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V=W/Q defined as work done by moving a coulomb of charge from one point to another point. W: work done, Q: electric charge(C) :warning:
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V∝I ,V=kI :warning: unit:Ω
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