Electrical Calculations is the best app in the electrical sector it has many calculations that can help you in your work. It can not miss in your smartphone!

Main calculations:
Wire size voltage drop current voltage active / apparent / reactive power power factor resistance Maximum wire length Current carrying capacity of insulated conductors / bare conductors / busbar Conduit fill Sizing the circuit breaker Admissible let-through energy of the cable (K²S²) Operating current Reactance Impedance Power factor correction Power factor correction of transformer MV/LV Capacitor power at different voltage Earthing system Short circuit current Conductor resistance Calculation of the cable temperature Power losses in cables Temperature sensors (PT/NI/CU NTC Thermocouples…) Analog signal values Joule effect Fault current of strings Risk assessment of overvoltages with atmospheric origin.

Electronic calculations:
Resistor / Inductor color code Fuses Sum resistors / capacitors Resonant frequency Voltage divider Current divider Zener diode as voltage stabiliser Resistance to reduce voltage Resistance for led Battery life Primary/Secondary winding of transformer Antenna length CCTV Harddrive/Bandwidth calculator.

Calculations concerning the motor:
Efficiency Motor from three-phase to single-phase Capacitor start motor single-phase Motor speed Motor slip Maximum torque Full-load current Diagrams of the three-phase motor Insulation class Motor connections Motor terminals marking.

Conversions:
Δ-Y Power AWG/mm²/SWG table Imperial / metric conductor size comparison Section Length Voltage (Amplitude) sin/cos/tan/φ Energy Temperature Pressure Ah/kWh VAr/µF Gauss/Tesla RPM-rad/s-m/s Frequency / Angular velocity Torque Byte Angle.

Resources:
Fuses application categories UL/CSA fuse class Standard resistor values Tripping curves Table of cables reactance Table of resistivity and conductivity Table of unitary voltage drop Dimensions and weight of cables IP/IK/NEMA protection classes Atex marking Appliance classes CCTV resolutions Thermocouple colour codes and data ANSI standard device numbers Electrical symbols Electricity around the world Plug and socket types IEC 60320 connectors C-Form Sockets (IEC 60309) Nema connectors EV charging plugs Wiring color codes SI Prefixes Units of measurement Pipes dimensions.

Pinouts:
Ethernet wiring (RJ-45) Ethernet with PoE RJ-9/11/14/25/48 Scart USB HDMI VGA DVI RS-232 FireWire (IEEE1394) Molex Sata Apple Lightning Apple Dock Connector DisplayPort PS/2 Fiber optic color code led Raspberry PI ISO 10487 (Car audio) OBD II XLR (Audio/DMX) MIDI Jack RCA color coding Thunderbolt SD Card Sim Card Display LCD 16x2 IO-Link.

The app also contains a very useful form.