Electrical Calculations Pro for Android phones and tablets.   scanned at virustotal.com with only 1 hit out of 59 by White Armor which flags most Android apps.   probably only flagged because it has internet access.   if  you are concerned about that get the app 'apk permission remover' and block it's access.   

Features:
Wire size
Calculation of voltage drop
Calculation of current
Calculation of voltage
Calculation of active power
Calculation of apparent power [PRO]
Calculation of reactive power [PRO]
Calculation of resistance
Motor from three-phase to single-phase
Capacitor start motor single-phase [PRO]
Calculation rpm motor [PRO]
Motor efficiency [PRO]
Maximum torque [PRO]
Diagram three-phase motor (6 leads)
Diagram three-phase motor (9 leads) [PRO]
Diagram three-phase motor (12 leads) [PRO]
Code resistors 4 colors
Code resistors 5-6 colors [PRO]
Color code inductor [PRO]
Colors resistor from value
SMD resistor code [PRO]
Fuses [PRO]
Sum resistors
Sum capacitors [PRO]
Conversion ?-Y [PRO]
Conversion HP/KW
Table AWG/mm²
Conversion of section
Conversion cm/inch
Conversion length [PRO]
Conversion voltage (Amplitude) [PRO]
Conversion sin/cos/tg/f [PRO]
Conversion energy [PRO]
Conversion temperature [PRO]
Conversion pressure [PRO]
Conversion Ah / kWh [PRO]
Conversion Gauss / Tesla [PRO]
Conversion RPM - rad/s - m/s [PRO]
Reactance [PRO]
Impedance [PRO]
Resonant frequency [PRO]
Voltage divider [PRO]
Zener diode as voltage stabiliser [PRO]
Resistance to reduce voltage
Resistance for led
Power factor correction [PRO]
Power factor correction of small loads [PRO]
Power factor correction of transformer MV/LV [PRO]
Battery life [PRO]
Primary/Secondary winding of transformer
Short circuit current [PRO]
Short circuit current with transformer substation [PRO]
Current carrying capacity IEC [PRO]
Current carrying capacity NEC [PRO]
Conductor resistance [PRO]
Table of cables reactance IEC [PRO]
Table of cables reactance NEC [PRO]
Table of resistivity [PRO]
IP/IK/NEMA protection classes
Antenna length [PRO]
Electrical symbols
Electricity around the world
Joule Effect [PRO]
Wiring color codes
SI Prefix
Unit of measurement
Fault current of strings [PRO]
Ethernet wiring (RJ-45) [PRO]
Pinout Ethernet with PoE [PRO]
RJ-11,14,25,48 [PRO]
Pinout Scart [PRO]
Pinout USB [PRO]
Pinout HDMI [PRO]
Pinout VGA [PRO]
Pinout DVI [PRO]
Pinout RS-232 [PRO]
Pinout FireWire (IEEE1394) [PRO]
Pinout molex [PRO]
Pinout Sata [PRO]
Pinout Apple Lightning [PRO]
Pinout Apple Dock Connector [PRO]
Pinout PS/2 [PRO]
Fiber optic color code [PRO]
Pinout led [PRO]
Pinout Raspberry PI [PRO]
Pinout ISO 10487 (Car audio) [PRO]
Pinout XLR (Audio/DMX) [PRO]
Formulary [PRO]

Languages:
- English (V.Ragona)
- Italiano (E.Gallina)
- Français (Y.Tschantz)
- Español (M.Rodriguez)
- Portuguese (BR) (J.Machacaz, M.Carvalho, P.Pepeleascov, A.Fraga)
- Arabic (G.Al_dahab, A.Qaissia)
- Polish (RaV, K.Szuba)
- Deutsch (D.Maggi, C.Ruffino, na2xs2y, JoHa)
- Greek (T.Pergantis)
- Latvian (W.Dzerins)
- Romanian (L.Voica, C.Duta, L.Petre)
- Turkish (E.HARMANBASI, B.Aydogdu)
- Russian (L.Tsvetinovich, V.Bolshakov, Djek.Energetik)
- Dutch (I.Proshel, R.Wintersteijn)
- Magyar (O.Csaba)
- Croatian (P.Razovic)
- Malay (N.Afdhal)
- Persian (B.Eskandariun, A.Tahmasebi, B.Lashgari TJ., R.Taherizadeh)
- Lithuanian (A.Kalasunas)
- Simplified Chinese (X.Cao)
- Serbian (Latin) (S.Fisic, V.Cvijovic, V.Lazarevic)
- Portuguese (PT) (L.Sousa)
- Czech (Skipy)
- Vietnamese (N.Duy Trung)
- Catalan (R.Vila, L.Martin Leona, antoine.nom36)
- Norwegian (drzordz)
- Bulgarian (I.Malinov)
- Swedish (J.Olandersson)
- Traditional Chinese (EricLee, J.Enrique Gutierrez)
- Slovenian (S.Veternik)
- Ukrainian (R.Korzh)
- Hebrew (R.keller)

WHAT'S NEW

v6.3.1:
* New: Translator Tool
* New: Splash screen
* Add: LinkedIn profile
* Upd: Russian language (by Leonid Tsvetinovich)
* Upd: Czech language (by Skipy)

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