A Activity diagram used in UML 6/9 and SysML B Bachman diagram Booch used in software engineering Block diagram Block Definition Diagram BDD used in SysML C Carroll diagram Cartogram Catalytic cycle Chemical equation Curly arrow diagram Category theory diagrams Cause-and-effect diagram Chord diagram Circuit diagram Class diagram from UML 1/9 Collaboration diagram from UML 2.0 Communication diagram from UML 2.0 Commutative diagram Comparison diagram Component diagram from UML 3/9 Composite structure diagram from UML 2.0 Concept map Constellation diagram Context diagram Control flow diagram Contour diagram Cordier diagram Cross functional flowchart D Data model diagram Data flow diagram Data structure diagram Dendrogram Dependency diagram Deployment diagram from UML 9/9 Dot and cross diagram Double bubble map used in education Drakon-chart E Entity-Relationship diagram ERD Event-driven process chain Euler diagram Eye diagram a diagram of a received telecommunications signal Express-G Extended Functional Flow Block Diagram EFFBD F Family tree Feynman diagram Flow chart Flow process chart Flow diagram Fusion diagram Free body diagram G Gantt chart shows the timing of tasks or activities used in project management Grotrian diagram Goodman diagram shows the fatigue data example: for a wind turbine blades H Hasse diagram HIPO diagram I Internal Block Diagram IBD used in SysML IDEF0 IDEF1 entity relations Interaction overview diagram from UML Ishikawa diagram J Jackson diagram K Karnaugh map Kinematic diagram L Ladder diagram Line of balance Link grammar diagram M Martin ERD Message Sequence Chart Mind map used for learning, brainstorming, memory, visual thinking and problem solving Minkowski spacetime diagram Molecular orbital diagram N N2 Nassi Shneiderman diagram or structogram a representation for structured programming Nomogram Network diagram O Object diagram from UML 2/9 Organigram Onion diagram also known as "stacked Venn diagram" P Package diagram from UML 4/9 and SysML Parametric diagram from SysML PERT Petri net shows the structure of a distributed system as a directed bipartite graph with annotations Phylogenetic tree - represents a phylogeny evolutionary relationships among groups of organisms Piping and instrumentation diagram P&ID Phase diagram used to present solid/liquid/gas information Plant Diagram Pressure volume diagram used to analyse engines Pourbaix diagram Process flow diagram or PFD used in chemical engineering Program structure diagram R Radar chart Radial Diagram Requirement Diagram Used in SysML Rich Picture R-diagram Routing diagram S Sankey diagram represents material, energy or cost flows with quantity proportional arrows in a process network. Sentence diagram represents the grammatical structure of a natural language sentence. Sequence diagram from UML 8/9 and SysML SDL/GR diagram Specification and Description Language. SDL is a formal language used in computer science. Smith chart Spider chart Spray diagram SSADM Structured Systems Analysis and Design Methodology used in software engineering Star chart/Celestial sphere State diagram are used for state machines in software engineering from UML 7/9 Swim lane Syntax diagram used in software engineering to represent a context-free grammar Systems Biology Graphical Notation a graphical notation used in diagrams of biochemical and cellular processes studied in Systems biology System context diagram System structure Systematic layout planning T Timing Diagram: Digital Timing Diagram Timing Diagram: UML 2.0 TQM Diagram Treemap U UML diagram Unified Modeling Language used in software engineering Use case diagram from UML 5/9 and SysML V Value Stream Mapping Venn diagram Voronoi diagram W Warnier-Orr Williot diagram Y Yourdon-Coad see Edward Yourdon, used in software engineering
单相220V，三相380V，其中三相是单相的根号3倍，即1.732倍。 注:往往在日常使用中火线不是单独存在，要和零线组成电气回路，写电压时，一般会加上接线方式，比如220V（L N G），380V (3P N G) 等。
图4：隔离变压器T和灯HL2均是单相负载，隔离变压器T的额定电压是线电压380V，而HL2则是相电压220V 由此可见，不存在什么两相电，只有单相电，区别就是电压为线电压还是相电压罢了。为何？因为供电电压的波形都是单相的正弦波，差别在电压有效值是380V或者是220V。
所以220v的耗损较小，可以使用较细的电线。 而日本等国出于安全考虑，同时他们的直流输出技术比较高，所以使用110V，这种技术中国还没有达到。 中国在布电网的时候主要是跟着苏联的路子走，所以当初设计的就是220V
简单来说，220v是我们常用的家庭民用电压范围。也就是一火一零，在电学上讲，它属于 相电压 范畴。380就是工厂常用的工业用电，线电压。也就是火线三相ABC之间的电压。而50赫兹是 交流电频率，因为交流电是时刻变化的量，一会儿从火线流进负载从零线流回 变压器，一会儿又从零线流进负载 ...
在很多自动化设备上，我们会发现24V要用，220V更要用。那么，对于这两种电压，我们该如何区分，或者需要我们格外注意什么呢？以个人8年的工作经验，简单说一下这个问题。 对于24V和220V，首先我们要搞明白它们之间的区别和联系。区别在24V通常是直流电的电压，而220V是交流电电压；联系在于24V ...
民用电abc 三相，每相对地都是220V。单相就是其中一相，两相就是其中各自独立的两相。如果是直接从任意两相的火线接电就是 线电压 380V。
电压标准（如220V、380V等）通常是由国家或地区的电力系统规划机构根据电力系统的需求和发展历史来规定的。 这些标准是为了确保电力系统的安全、稳定运行以及满足用户的需求而设立的。 关于220V和380V，它们通常代表了不同的电压等级： 220V：
注意：直流电的平均值不等于零，而交流电的平均值等于零。 由此可见，题主在主题中把220V交流电压的有效值认定是 220V，是何等的错误，完全是基本概念不清。 题主考试会不及格哦！ ！！ 要是我来评分，我会给题主0分！ ！！
指正，现为220V）、英国、德国、法国、意大利、澳大利亚、印度、新加坡、泰国、荷兰、西班牙、希腊、奥地利、菲律宾、挪威等约120个国家和地区使用是交流220V电压区域； 而美国、加拿大、日本（100V）、我国台湾省等国家和地区则是110V电压区域。 还有的国家是两种兼有，如古巴（110V、220V ...
采用220～230V电压的国家里，也有视具体需求并用110～130V电压的情形，如瑞典、俄罗斯。 很多人疑惑：电压低一点，貌似安全一点，那么为什么我国的用电标准电压为什么是220V? 下面咱们在一起回顾一下关于电压的历史路程：220v与110v的发展的故事
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