Bilingual edition: English is preserved and Chinese follows each unit. Terminology uses the confirmed v20260916 glossary; automated semantic review remains traceable.
中英双语版：英文原文完整保留，中文紧随对应单元；术语采用 v20260916 确认表，自动语义审校结果可追溯。

Current Law and Flowrate

电流定律和流量


For any circuit, fluid or electric, which has multiple branches and parallel elements, the flowrate through any cross-section must be the same. This is sometimes called the principle of continuity.

对于任何电路，无论是流体还是电的，只要具有多个分支和并联元件，通过任何横截面的流量必须相同。这有时被称为连续性原理。
Water analogy to DC circuits
水的类比用于直流电路
Voltage law
电压定律
Current law
电流定律
 Index

DC Circuits
索引：直流电路
 
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Voltage Law and Pressure

电压定律和压力


Water analogy to DC circuits
水的类比用于直流电路
Voltage law
电压定律
Current law
电流定律
 Index

DC Circuits
索引：直流电路
 
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Ohm's Law-Poiseuille's Law

欧姆定律-泊肃叶定律

Ohm's law for electric current flow and Poiseuille's law for the smooth flow of fluids are of the same form.

欧姆定律描述电流流动，而泊肃叶定律描述流体的平稳流动，形式相同。

Water analogy to DC circuits
水的类比用于直流电路
 Index

DC Circuits
索引：直流电路
 
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Will the bird on the high voltage wire be shocked?

高压电线上的鸟会被电到吗？

Electric current flow is proportional to voltage difference according to Ohm's law, and both the bird's feet are at the same voltage. Since current flow is necessary for electric shock, the bird is quite safe unless it simultaneously touches another wire with a different voltage.

根据欧姆定律，电流流动与电压差成正比，而鸟的双脚处于相同的电压。由于电流流动是电击的必要条件，因此鸟是安全的，除非它同时接触到另一根电压不同的导线。

Want a scary job? Maintenance on high voltage transmission lines is sometimes done with the voltage "live" by working from a platform on a helicopter, sitting on a metal platform! The helicopter must make sure it doesn't touch neighboring wires which are at a different voltage.

想要一份吓人的工作吗？高压输电线路的维护有时是在带电状态下进行的，工人从直升机上的平台作业，坐在金属平台上！直升机必须确保不接触处于不同电压的邻近导线。
Water analogy to DC circuits
水的类比用于直流电路
 Index

DC Circuits
索引：直流电路
 
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Basic DC Circuit Relationships

基本直流电路关系
DC circuits can be completely analyzed with these four relationships.
直流电路可以完全用这四个关系进行分析
Ohm's law
欧姆定律
I = V/R
Power relationship
功率关系
P = VI
功率P等于电压V乘以电流I。
Voltage Law
电压定律
The net voltage change is equal to zero around any closed loop. (This is an application of the principle of conservation of energy.)
任何闭合回路中的净电压变化都等于零。（这是能量守恒原理的应用。）
Current Law
电流定律
The electric current in = electric current out of any junction. (Conservation of charge)
电流流入任何节点等于电流流出。 (电荷守恒)
Water analogy to DC circuits
水的类比用于直流电路
 Index

DC Circuits
索引：直流电路
 
HyperPhysics***** Electricity and Magnetism
HyperPhysics ***** 电学和磁学
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