E08F
Useful Tables for Units of Measure
in Electrical Engineering

Electrical Units

Simple and Complex Tables


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SI electromagnetism units
Name Symbol Dimensions Quantity
ampere (SI base unit) A A Current
coulomb C A新 Electric charge, Quantity of electricity
volt V J/C = kg搶2−3−1 Potential difference
ohm Ω V/A = kg搶2−3−2 Resistance, Impedance, Reactance
ohm metre Ω搶 kg搶3−3−2 Resistivity
farad F C/V = kg−1−224 Capacitance
farad per metre F/m kg−1−324 Permittivity
reciprocal farad F−1 kg12−2−4 Elastance
siemens S Ω−1 = kg−1−232 Conductance, Admittance, Susceptance
siemens per metre S/m kg−1−332 Conductivity
weber Wb V新 = kg搶2−2−1 Magnetic flux
tesla T Wb/m2 = kg新−2−1 Magnetic flux density
ampere per metre A/m m−1 magnetic induction
ampere-turns per weber A/Wb kg−1−222 Reluctance
henry H V新/A = kg搶2−2−2 Inductance
henry per metre H/m kg搶新−2−2 Permeability
(dimensionless) - - Magnetic susceptibility

Required Direct
current
Alternating current
Single-phase 3-phase*
KVA   IE  
1000
 1.73 IE 
1000
Kilowatts   IE  
1000
  IE (pf)  
1000
  1.73 IE (pf)  
1000
Horsepower (output) IE (eff)/746 IE (eff)(pf)/746 1.73 IE (eff)(pf)/746
Joules IE/sec IE (eff)(pf)/sec 1.73 IE (eff)(pf)/sec
Amperes (hp known) 746 (hp)/E (eff) 746 (hp)/E (eff)(pf) 746 (hp)/1.73 E (eff)(pf)
Amperes (KW known) 1000 KW/E 1000 KW/E (pf) 1000 KW/1.73 E (pf)
Amperes (kva known) 1000 KVA/E 1000 KVA/1.73 E

Volt(E) is the unit of electric pressure or electromotive force.
It is the potential that will produce a current of 1 ampere through a resistance of 1 ohm.

Ampere (I) is the unit of electrical current (coulombs per second).

Ohm (R) is the unit of electrical resistance (volts/ampere).

Watts (W) and kilowatts (KW) are units of electric power.

Kilovolt-ampere (KVA) is a measurement of apparent electric power.

Kilowatt hour (Kwhr) is a unit of electrical energy or work performed.

Joule (J) is a metric unit of energy: watt per second.
1 Kwhr = 2,655,000 ft-lb = 1.341 hp-hr = 3413 Btu = 3,600,000 joules.

Ohm law relationships (direct current) E = IR + W/I = √WR
W = I2R = E2/R = EI
I = E/R = W/E = √W/R
R = E/I = W/I2 = E2/W



Left Hand Rule for Coils

If you don't yet know about Get It now is the time to find out!


Web Site Development

Lesson 2.3 -Tables with In-Line Style
Outlines and the Ordered List - Images

JavaScript and the DOM

By Alain Lareau

This Page is HTML 4.01 Transitional and its DTD ( Document type Definition ) looks like this:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
On this page for much of the lesson text we will endeavor to not use font tags in the code and only use them to set attributes for size in special circumstance, instead we will employ in-line style properties as would be needed in HTML5. In the Lesson 2.2 we showcased the particular syntax of the style rules, we do that again here. There are some circumstances with tables you desire the style to sit In-Line in the element tags or even 'font' tags with the table data.
This would help make the table portable.

Also this page " Useful Tables for Units of Measure in Electrical Engineering" has two two tables showcased, each are dense with style. This accomplishes a durable character to the tables in that they may be copied from page to page and will retain the style appearance.To be clear the Tag is not given attributes as you would with a 'font' Tag, rather the object Tag is assigned the attribute 'style' then in turn 'rules' are defined as values to that attribute. (this is called in-line style) In this case we are decorating a table, and we continue to use tags with assigned attributes, except the 'font' tag's use is discontinued. Even if we wish qualities to reside at the Object Tag Element level much can be done with style inside that tag.

<th style="border-style: solid; border-width: 1" bgcolor="#999999" width="127">
<font face="Arial" color="#FFFFFF">Name</font></th>

It may be worth pointing out that the cell width set in the 'th' ELEMENT controls the width of the whole colunm. The ELEMENT name for setting an image is 'img'. It uses an attribute to point to the sorce of the image file but instead of 'href' as in the 'a' tag the attribute name is 'src' and it is desired to have additional attribute paired to this named 'alt' which if the image does not load can display text or trigger an audio file.

<img
src="http://metaphorman.tripod.com/lefthandruleforcoils.gif"
alt="left hand rule for coils"
width="582"
height="847">
use a line-break here <br>so text does not pile up on the right side of the image.
On this this page the aforesaid is nested in a paragraph tag with center alignment.

<p align="center"><br>
<img src="http://metaphorman.tripod.com/lefthandruleforcoils.gif" width="582" height="847">
<br></p>

Height and Width values can be set as attributes or in style/CSS format. Consider the 'img' tag very much
an In-Line ELEMENT for the time being and take care in deciding how or if you wish text to wrap around it. To illustrate I will place an image in this line of code now dancing M&M this guy, the first image I ever loaded to a server, using only one tag 'img' and one 'attribute' in that tag ' src="http://xxx" '.

If I used line break tags 'br' before and after then it would sit in a line by itself.

dancing M&M


That is a good little intro to images in text. The Ordered List which we talk about next has features that lend to facilitate the basis for the presentation of an Outline.
We illustrate, below is a nested outline generated with tags 'ol' for Ordered List.
To the right is the code that produces it.

  1. Subsuming
    1. General
      1. Topical
        1. Specific
          1. Micro-specific
            Super-specific

ol { font-family: "Comic Sans MS", cursive; font-size: 14pt }

Above is the in-head Style Rule that sets the font and size of the Ordered List Text.

		<ol start="1" type="I">
		<li>Subsuming</li>
		<ol start="1" type="A">
		<li>General</li>
		<ol start="1" type="1">
		<li>Topical</li>
		<ol start="1" type="a">
		<li>Specific</li>
		<ol start="1" type="i">
		<li>Micro-specific<br>
		Super-specific</li>
		</ol>
		</ol>
		</ol>
		</ol>
		</ol>
		


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