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===== Calculator of AL value from inductance and number of turns =====

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|  {{/calculator/icon_calc.png?50&nolink}}  | //[[user/Stan Zurek]], Calculator of AL value from inductance and number of turns, Encyclopedia Magnetica//, \\ https://www.e-magnetica.pl/doku.php/calculator/al_value_from_inductance_and_number_of_turns, {accessed: @YEAR@-@MONTH@-@DAY@} |
|  {{/wiki/logo.png?20&nolink}} //See more: [[/Calculators of inductance]]//  ||
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^ AL factor  ^^^
| //Source: [1] [[https://isbnsearch.org/isbn/9783899291575|Thomas Brandner, Alexander Gerfer, Bernhard Rall, Heinz Zenkner, Trilogy of Magnetics: Design Guide for EMI filter design, SMP & RF circuits, 5th Edition, Würth Elektronik eiSos GmbH & Co. KG, 2018, Künzelsau, ISBN 9783899291575]]//  |||
|  //[1] eq. (1.34), p. 38//    $$ A_L = \frac{L}{N^2} $$  |  (H/turn<sup>2</sup>) ≡ (H)  |
| where: $L$ - [[/inductance]] (H), $N$ - [[/number of turns]] (unitless)  |||

<HTML>
<!-- ==================== calculator starts here ============== -->
<HEAD>
<SCRIPT Language="JavaScript">

<!--
/**
 * Function that introduces calculator of a given function.
 **/
 
function getSelectedValue(selectList){
   return selectList[selectList.selectedIndex].value
}

function calculate_function(frm){
// set up variables
var L          = frm.L.value
var turns       = frm.turns.value
var result      = "0"
var L_unit     = getSelectedValue(frm.L_unit)
var result_unit = getSelectedValue(frm.result_unit)

// read values and convert to numbers
L = parseFloat(L)
L_unit = parseFloat(L_unit)
turns = parseFloat(turns)
result_unit = parseFloat(result_unit)

// calculate the main function
result = L * L_unit / turns / turns / result_unit

// format number to x digits precision, result will equal 5.611e+2
result = result.toPrecision(4)

// display result
frm.result.value = result

}

//-->
</SCRIPT>
</HEAD>
<body>

<form method="post" action="">
 
<i>L</i> = <input type="text" value="250" name="L" size="10" maxlength="10" onChange="calculate_function(this.form)"> 
 
          <SELECT name="L_unit" onChange="calculate_function(this.form)">
           <OPTION value="1e-9">(nH)</OPTION>
           <OPTION value="1e-6" selected>(&mu;H)</OPTION>
           <OPTION value="1e-3">(mH)</OPTION>
           <OPTION value="1">(H)</OPTION>
        </SELECT> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
 
number of turns <i>N</i> = <input type="text" value="10" name="turns" size="10" maxlength="10" onChange="calculate_function(this.form)"> <br><br>

<input type="button" name="Button" value="Calculate" onClick="calculate_function(this.form)"> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 

<b><i>A<sub>L</sub></i> value</b> = <input type="text" name="result" size="10" maxlength="10"> 
 
           <SELECT name="result_unit" onChange="calculate_function(this.form)">
           <OPTION value="1e-9" selected>(nH/t&sup2;)</OPTION>
           <OPTION value="1e-6">(&mu;H/t&sup2;)</OPTION>
           <OPTION value="1e-3">(mH/t&sup2;)</OPTION>
           <OPTION value="1">(H/t&sup2;)</OPTION>
        </SELECT><br>
 </form>
 

</BODY>
<!-- ==================== calculator ends here ============== -->
</HTML>


(See also the calculator of **[[calculator/inductance from AL value and number of turns]]**).

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{{tag>Calculators AL_value Inductance_factor}}