Электричество и магнетизм
OxfordAQA · International GCSE · Physics Тема 5 4:50 Английское озвучивание · Английский + китайские субтитры (встроенные)
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Electricity is charge on the move, guided by potential difference, resisted by every component — and every current makes a magnetic field OxfordAQA's largest topic builds the circuit toolkit, the component behaviours, and the electromagnets that follow
电是移动的电荷，由电势差引导，受每个元件阻碍。 并且每处电流都会产生磁场。 牛津AQA最大的专题构建了电路工具包、元件行为以及随之而来的电磁铁。
Metals conduct because they have free electrons; (P) an isolated charge imbalance is static electricity, discharged when a conducting route appears (lightning) I = Q/t V = E/Q V = I x R
金属导电是因为它们拥有自由电子。 孤立的电荷不平衡即为静电，当出现导电路径时便会放电，例如闪电。 电流I等于Q除以t。 电压V等于E除以Q。 电压V等于电流I乘以电阻R。
Poles: like repel, unlike attract — non-contact forces Field lines run N to S outside a magnet; opposite poles facing give a uniform field between them
磁极：同名磁极相斥，异名磁极相吸。 这些是非接触力。 磁感线在磁铁外部从北极指向南极。 相对放置的异名磁极会在它们之间产生匀强磁场。
Work the checklist against the handout's worked examples.
对照讲义上的例题完成自查清单。