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Voltage Drop Calculator

Calculate voltage drop in electrical circuits based on wire size, length, current load, and conductor material. Electrical engineering calculator per NEC and IEC standards. Essential for electrical installation design and power distribution planning.

Ohm's Law for Voltage Drop

Vd = I × R × L × 2

Variables:

  • VdVoltage drop (V)
    Voltage drop (V)
  • ICurrent (A)
    Current (A)
  • RResistance per unit length (Ω/km)
    Resistance per unit length (Ω/km)
  • LCable length (km)
    Cable length (km)

How to Use

  1. 1

    Input Arus

    Enter arus beban (A).

  2. 2

    Select Kabel

    Select ukuran kabel (mempengaruhi R).

  3. 3

    Input Panjang

    Enter panjang kabel (m).

  4. 4

    Calculate

    Dapatkan tegangan jatuh and persentase.

Examples

Kabel 2.5mm²

Problem:

I=10A, R=7.41Ω/km, L=50m. Vd?

Solution:
  1. 1.Vd = 10 × 7.41 × 0.05 × 2
  2. 2.Vd = 7.41V
Result:Vd = 7.41V (3.1% from 240V)

Tegangan jatuh 3.1%, masih in batas aman (<5%).

Frequently Asked Questions

Berapa batas aman voltage drop?
Umumnya maksimal 3-5% from tegangan sumber.
Why dikali 2?
Karena arus harus kembali melalui kabel netral, jadi panjang efektif 2x.

Related Calculators

Hukum Ohm

V = I × R

References