Kalkulator kW ke Amps Logo
Kalkulator kW ke Amps
💡 Penukaran Elektrik

Watt kepada Amp Kalkulator

Masukkan kuasa anda dalam watt dan voltan sistem untuk mengetahui aliran arus. Sesuai untuk sistem pencahayaan, peralatan rumah kecil, dan elektronik berkuasa rendah.

Parameter Litar

Watt → Amp

Perpuluhan
3
Arus Dikira
—
A

Tahap arus yang selamat membantu mengelakkan wayar terlalu panas.

—
—

Formula Penukaran

Penukaran watt kepada amp memerlukan pengetahuan tentang voltan litar — dan faktor kuasa untuk sistem AC.

Sistem DC
I = W ÷ V

Bentuk paling ringkas Hukum Ohm — bahagikan watt dengan volt untuk mendapatkan amp dalam mana-mana litar DC.

AC 1-Fasa
I = W ÷ (V × PF)

Beban AC dengan faktor kuasa di bawah 1.0 menarik lebih banyak arus daripada yang dicadangkan oleh penilaian wattnya — disebabkan komponen reaktif.

AC 3-Fasa
I = W ÷ (√3 × V × PF)

Sistem tiga fasa mengagihkan kuasa merentasi tiga fasa — faktor √3 adalah wajib untuk penukaran voltan talian-ke-talian.

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.