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Kalkulator kW ke Amps
📉 Penukaran Elektrik

Volt kepada Amp Kalkulator

Fahami hubungan antara voltan dan arus. Kira dengan tepat berapa amp yang akan terhasil daripada voltan dan beban kuasa yang diberikan.

Analisis Arus

Voltan + Kuasa → Amp

Perpuluhan
2
Amperan Dikira
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A

Aliran arus yang akan berlaku pada litar tersebut.

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Formula Penukaran

Pengiraan arus berubah bergantung sama ada litar anda DC atau AC — dan pada faktor kuasa untuk sistem AC.

Sistem DC
I = (kW × 1000) ÷ V

Arus terus tidak mempunyai sudut fasa — arus hanyalah kuasa dibahagi dengan voltan.

AC 1-Fasa
I = (kW × 1000) ÷ (V × PF)

Faktor kuasa mengurangkan kuasa efektif dalam litar AC. PF 0.9 bermaksud 10% lebih arus ditarik berbanding yang dicadangkan oleh kuasa sebenar.

AC 3-Fasa
I = (kW × 1000) ÷ (√3 × V × PF)

Kuasa tiga fasa diagihkan merentasi tiga konduktor — faktor √3 (1.732) mengambil kira hubungan fasa antara mereka.

How to Convert Volts to Amps

Converting voltage to current requires knowing the power being consumed or the resistance in the circuit. When you know power (in kW or W), Ohm's Law and the power formula give you current directly. This calculation is essential for sizing circuit breakers, fuses, wire gauges, and selecting protective equipment.

Why Voltage and Current Move in Opposite Directions

For a fixed load, doubling the voltage halves the current. This inverse relationship is why high-voltage transmission lines carry massive power across long distances using thin cables — lower current means less resistive heating and power loss in the wire.

Practical Applications

  • Circuit Breaker Sizing: A 2kW heater on 240V single-phase draws about 8.7A at unity PF — you'd protect it with a 10A or 15A breaker.
  • Wire Gauge Selection: Higher current requires thicker wire to stay within safe temperature limits. Use the NEC or IEC ampacity tables after calculating current.
  • Fuse Selection: Fuses must be rated at 125% of continuous load current. Calculate first, then select the fuse size.
  • Motor Nameplate Verification: Cross-check the listed FLA (Full Load Amps) against the calculated current from rated HP and voltage.

Step-by-Step Conversion

  1. Note the Power: Find the kW or watt rating on the equipment label.
  2. Read the Voltage: Confirm the system voltage — check the supply panel or equipment nameplate.
  3. Identify AC or DC: DC circuits use the simple formula; AC circuits need the power factor applied.
  4. Calculate and Size Up: Always round up to the next standard breaker or fuse size after calculating.