This app contains electrical calculations, electronic calculations, lighting calculations, motor calculations, conversions and pinouts.

Electrical:
Calculation of Wire Size
Calculation of Voltage Drop
Calculation of Voltage
Calculation of Current
Calculation of Power
Calculation of Power Factor
Calculation of Resistance
Calculation of Impedance
Calculation of Reactance
Calculation of Impedance (from Resistance and Reactance)
Conductor Resistance
Maximum Wire Length
Sizing the Circuit Breaker
Current Carrying Capacity of Insulated Conductors
Current Carrying Capacity of Bare Conductors
Calculation of Cable Temperature
Calculation of Power Losses in Cable
Admissible Let-Through Energy of the Cable (K²S²)
Short-Circuit Current Min
Earthing System
Lightning Protection Level
Risk Assessment of Overvoltages with Atmospheric Origin
Capacitor Power at Different Voltage
Power Factor Correction
Power Factor Correction of Transformer MV/LV
Primary/Secondary Winding of Transformer

Electronics:
BJT DC Analysis
BJT AC Analysis
FET DC Analysis
FET AC Analysis
Filter Calculator
Op-Amp Calculator
NE555 Calculator
Voltage Regulator Calculator
Voltage Divider
Current Divider
Resonant Frequency
Wheatstone Bridge
Zener Diode as Voltage Stabiliser
Resistance to Reduce Voltage
Resistance for LED
Battery Life
Temperature Sensors
Antenna Length

Basics:
Connection of Resistor
Connection of Inductor
Connection of Capacitor
Resistor Color Code
Resistor Colors from Value
Inductor Color Code
SMD Resistor Code
Standard Resistor Values
Inductor Codes
Capacitor Codes
Fuses Color Code

Lighting:
Calculation of Total Flux
Calculation of Luminaires Number
Illuminance on the Surface
Power Supply for Strip LED

Solar:
PV String Sizing
Fault Current of Strings

Motor:
Calculation of Motor Current
Calculation of Motor Power
Calculation of Motor Power Factor
Calculation of Motor Efficiency
Calculation of Motor Torque
Calculation of Motor RPM
Calculation of Motor Slip
Motor Power Factor Correction
Motor Voltage Unbalance
Motor Current Unbalance
Motor Insulation Class
Motor Terminals Marking
Diagrams of the Three-Phase Motor

Conversions:
Δ-Y (Delta/Star)
kWh-Ah
Power
Voltage
Section
Trigonometric
Angle
Angular-Linear Velocity
Length
Energy
Pressure
Torque
Magnetic
Temperature
Volume
Weight
Time
Luminance
Illuminance
Lumens-Lux
Lumens-Watts
Lumens-Candela
Lux-Watts
Lux-Candela
Lux-Foot Candle
Luminance-Exposure Value
Illuminance-Exposure Value
RGB-CMYK
RGB-HEX
Kelvin-RGB

Resources:
Tripping Curves
Fuses Application Categories
UL/CSA Fuse Classes
Appliance Classes
IP/IK/NEMA Protection Classes
ATEX Marking
Wire Size Conversion Table
Imperial/Metric Conductor Size Comparison Table
Table of Cables Reactance
Table of Resistivity and Conductivity
Table of Unitary Voltage Drop
SI Prefixes
Units of Measurement
CCTV Resolutions
Pipes Dimensions
Thermocouple Color Codes
Wiring Color Codes
Fiber Optic Color Code
Electricity Around the World
Plug and Socket Types
EV Charging Plugs
Types of Lamp
Fittings of Lamp
Bulb Shapes
Table Luminous Efficacy
SMD LED
Generic Tables for Power Factor Correction Lamps 220V
Unified Glare Rating
Color Rendering Index
Color Temperature
Visible Spectrum

Pinouts:
Ethernet Wiring
Power over Ethernet
Registered Jack
USB
RS-232
FireWire
Molex
SATA
PS/2
HDMI
VGA
DVI
SCART
S-Video
XLR
MIDI
ISO 10487
Apple Lightning
Apple Dock Connector
Thunderbolt
SD Card
Sim Card
Raspberry PI
LED
LCD
IEC 60320 Connectors
IEC 60309 Connectors
Nema Connectors