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Kalkulator kW ke Amper
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Watt ke Ampere Kalkulator

Masukkan daya Anda dalam watt dan tegangan sistem untuk menemukan arus. Ideal untuk sistem pencahayaan, peralatan rumah tangga kecil, dan elektronik berdaya rendah.

Parameter Sirkuit

Watt → Ampere

Desimal
3
Arus Terhitung
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A

Tingkat arus yang aman membantu mencegah kabel terlalu panas.

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Rumus Konversi

Konversi watt ke ampere memerlukan pengetahuan tentang tegangan sirkuit — dan faktor daya untuk sistem AC.

Sistem DC
I = W ÷ V

Bentuk paling sederhana dari Hukum Ohm — bagi watt dengan volt untuk mendapatkan ampere pada sirkuit DC apa pun.

AC 1-Fase
I = W ÷ (V × PF)

Beban AC dengan faktor daya di bawah 1,0 menarik lebih banyak arus daripada yang disarankan oleh rating wattnya — karena komponen reaktif.

AC 3-Fase
I = W ÷ (√3 × V × PF)

Sistem tiga fase mendistribusikan daya melalui tiga fase — faktor √3 wajib digunakan untuk konversi tegangan antar-fase.

How to Convert Watts to Amps

The watts-to-amps conversion is one of the most frequently used calculations in electrical work — from selecting the right fuse for an electronics project to sizing a circuit breaker for a household appliance. Watts measure real power consumed; amps measure the current flowing through the conductor. You need voltage (and power factor for AC) to bridge the two.

Watts vs. VA: What's the Difference?

Watts (W) measure real power — the energy actually converted to heat, light, or motion. Volt-Amperes (VA) measure apparent power — what the source must supply, including reactive current. For resistive loads (heaters, incandescent bulbs) they're equal. For inductive loads (motors, transformers), VA is always higher than watts.

Common Household Examples

  • 1500W Space Heater at 120V DC: 1500 ÷ 120 = 12.5A. Needs a 15A circuit at minimum.
  • 800W Microwave at 120V AC (PF 0.95): 800 ÷ (120 × 0.95) ≈ 7.0A. Comfortably fits a 15A circuit.
  • 3000W Dryer at 240V AC (PF 1.0): 3000 ÷ 240 = 12.5A — typically wired on a 30A circuit to allow for startup transients.

Step-by-Step Conversion

  1. Find the Wattage: Check the device label, user manual, or measured consumption with a watt meter.
  2. Confirm the Voltage: Use the outlet voltage — 120V or 240V in North America; 230V in Europe.
  3. Apply the Power Factor: Use 1.0 for pure resistive loads (heaters, light bulbs). Use 0.8–0.9 for motors and most AC equipment.
  4. Size Your Protection: The calculated amps is the continuous draw. Size breakers and fuses at 125% of continuous load per NEC requirements.