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OHMs Law Calc

By Caladan Software

This app is only available on the App Store for iOS devices.


Calculates OHM's Law for Single and Three Phase Applications. This app uses proper vector calculations to accurately calculate BOTH balanced and unbalanced Three Phase loads. Calculate Watts, Volts, Amps or Ohms easily and quickly. Back calculate Load resistance from voltage and Phase Amps. Just pick a wedge from the OHM's law circle and go! NOW WITH WIDGET SUPPORT!

What's New in Version 1.51

Adjusts visuals to be more like iOS 8


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Customer Reviews

Incorrectly calculates for AC

Good attempt, but this calculator works 100% correctly ONLY for DC.

For AC, it ignores Power Factor (PF), caused by ever present out-of-phase Reactive currents. All AC "Power" results are really in "Volt-Amps" (VA) not Watts.

For 3-Ph AC it incorrectly calculates VA, when given Voltage & Current. The correct method is: V x A x 1.73 (Sq Root of 3) = VA

Power in Watts is then:
VA x PF = Watts

PF is always a number between 0 & 1, with 1 being in-phase (purely resistive) current, and 0 being 90 deg out-of-phase (purely reactive) current.

For calculations (where actual PF is unknown) a PF of 0.8 is typically used.

Resistance alone in never the only factor in AC Circuits.

OHMs Law Calc
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This app is designed for both iPhone and iPad
  • $1.99
  • Category: Reference
  • Updated:
  • Version: 1.51
  • Size: 9.5 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 6.0 or later. Compatible with iPhone, iPad, and iPod touch.

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