.. naslov: Pretvorba volt vat ampera
.. polž: pretvornik volt-vat-amper
.. datum: 2025-12-26 15:00:00 UTC
.. oznake: mreženje, kalkulator, orodje
.. kategorija: Kalkulatorji
.. povezava:
.. opis: Volt Watt Ampere Conversion - Spletni kalkulator
.. vrsta: besedilo
<style>
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    /* Responsive design */
    @media (max-width: 768px) {
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</style>
<div class="calc-container">
<div class="calc-header">
<h2>Kalkulator pretvorbe volt vat amper</h2>
<p>Izračunajte razmerja električne moči med napetostjo, močjo in amperažo. Vnesite poljubni dve vrednosti za izračun tretje.</p>
<div class="input-grid">
<div class="input-group">
<label for="voltage">Napetost (V):</label>
<input autocomplete="off" id="voltage" type="text" value="0"/>
</div>
<div class="input-group">
<label for="wattage">Moč (W):</label>
<input autocomplete="off" id="wattage" type="text" value="0"/>
</div>
<div class="input-group">
<label for="amperage">Amperaža (A):</label>
<input autocomplete="off" id="amperage" type="text" value="0"/>
</div>
</div>
<div class="checkbox-group">
<input id="threePhase" onchange="voltwattamp()" type="checkbox"/>
<label for="threePhase">3-fazno napajanje (uporablja množitelj √3 za napetost med linijami)</label>
</div>
<div class="button-container">
<button class="calc-button" onclick="voltwattamp()" type="button">Izračunaj</button>
</div>
<div class="help-text">
<strong>Kako uporabljati:</strong>Vnesite kateri koli dve vrednosti (napetost, moč ali amperaža) in kliknite Izračunaj, da poiščete tretjo vrednost. Označite polje 3-fazno za izračune trifazne moči.</div>
</div>
<div class="result-section">
<div class="section-header">Izračunani rezultati<span class="phase-indicator" id="phaseIndicator">Enofazni</span>
</div>
<div class="section-content">
<div class="result-grid">
<div class="data-row">
<div class="data-label">Izračunana napetost:</div>
<div class="data-value" id="voltResult">-</div>
</div>
<div class="data-row">
<div class="data-label">Izračunana moč:</div>
<div class="data-value" id="wattResult">-</div>
</div>
<div class="data-row">
<div class="data-label">Izračunana amperaža:</div>
<div class="data-value" id="ampResult">-</div>
</div>
</div>
<div class="formula-info" id="formulaInfo">
<strong>Uporabljene formule (enofazni):</strong><br/>Napetost (V) = Moč (W) / Amperaža (A)<br/>Moč (W) = Napetost (V) × Amperaža (A)<br/>Amperaža (A) = moč (W) / napetost (V)</div>
</div>
</div>
</div>
<script>
function voltwattamp() {
    // Set variables from input
    var volt = Number(document.getElementById("voltage").value);
    var watt = Number(document.getElementById("wattage").value);
    var amp = Number(document.getElementById("amperage").value);

    // Check if 3-phase is enabled
    var isThreePhase = document.getElementById("threePhase").checked;
    var multiplier = isThreePhase ? Math.sqrt(3) : 1; // √3 ≈ 1.732

    // Calculate results based on phase type
    var voltres, wattres, ampres;

    if (isThreePhase) {
        /*
        3-Phase formulas (assuming unity power factor and line-to-line voltage):
        P = √3 × V × I
        V = P / (√3 × I)
        I = P / (√3 × V)
        */
        voltres = watt / (multiplier * amp);
        wattres = multiplier * volt * amp;
        ampres = watt / (multiplier * volt);
    } else {
        /*
        Single-phase formulas:
        V = P / I
        P = V × I
        I = P / V
        */
        voltres = watt / amp;
        wattres = volt * amp;
        ampres = watt / volt;
    }

    // Format results with units
    document.getElementById("voltResult").innerHTML = isFinite(voltres) ? voltres.toFixed(2) + ' V' : '-';
    document.getElementById("wattResult").innerHTML = isFinite(wattres) ? wattres.toFixed(2) + ' W' : '-';
    document.getElementById("ampResult").innerHTML = isFinite(ampres) ? ampres.toFixed(2) + ' A' : '-';

    // Update phase indicator
    document.getElementById("phaseIndicator").textContent = isThreePhase ? '3-Phase' : 'Single-Phase';

    // Update formula display
    var formulaInfo = document.getElementById("formulaInfo");
    if (isThreePhase) {
        formulaInfo.innerHTML = `
            <strong>Formulas used (3-Phase):</strong><br>
            Voltage (V) = Wattage (W) / (√3 × Amperage (A))<br>
            Wattage (W) = √3 × Voltage (V) × Amperage (A)<br>
            Amperage (A) = Wattage (W) / (√3 × Voltage (V))<br>
            <em>Note: √3 ≈ 1.732 (assumes unity power factor and line-to-line voltage)</em>
        `;
    } else {
        formulaInfo.innerHTML = `
            <strong>Formulas used (Single-Phase):</strong><br>
            Voltage (V) = Wattage (W) / Amperage (A)<br>
            Wattage (W) = Voltage (V) × Amperage (A)<br>
            Amperage (A) = Wattage (W) / Voltage (V)
        `;
    }
}

// Add enter key support for inputs
document.addEventListener('DOMContentLoaded', function() {
    const inputs = document.querySelectorAll('#voltage, #wattage, #amperage');
    inputs.forEach(input => {
        input.addEventListener('keypress', function(e) {
            if (e.key === 'Enter') {
                voltwattamp();
            }
        });
    });
});
</script>