kW till Ampere Kalkylator Logotyp
kW till Ampere Kalkylator
📉 Elektrisk Omvandling

Volt till Ampere Kalkylator

Förstå sambandet mellan spänning och ström. Beräkna exakt hur många ampere som blir resultatet av en given spänning och effektbelastning.

Strömanalys

Spänning + Effekt → Ampere

Decimaler
2
Beräknad Strömstyrka
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A

Det resulterande strömflödet som uppstår i kretsen.

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Omvandlingsformeln

Strömberäkningen ändras beroende på om din krets är DC eller AC — och på effektfaktorn för AC-system.

DC-system
I = (kW × 1000) ÷ V

Likström har ingen fasvinkel — strömmen är helt enkelt effekten dividerad med spänningen.

1-fas AC
I = (kW × 1000) ÷ (V × PF)

Effektfaktorn minskar den effektiva effekten i AC-kretsar. En effektfaktor på 0,9 innebär att 10 % mer ström dras än vad den verkliga effekten antyder.

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

Trefaseffekt fördelas över tre ledare — faktorn √3 (1,732) tar hänsyn till fasrelationen mellan dem.

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.