Electrical Systems

Overview

Engineering reference data for Electrical Systems in electrical engineering.

Key Formulas

Ohm's Law

$V = IR$

Voltage = Current × Resistance.

Power

$P = VI = I^2R = V^2/R$

Electrical power.

Energy

$E = Pt$

Energy = Power × Time.

Variables

Electrical Systems: Common Applications and Related Resources

This section provides organized access to related engineering calculators, charts, and detailed technical guides referenced throughout the site.

Wire and Cable Specifications

• AWG Wire Gauge Standards
  Chart and table for American Wire Gauge (AWG) with specifications on wire diameter, resistance, and ampacity, including conversions to metric units.
• Copper and Aluminum Wire - Max Amps vs. Gauge
  Maximum current ratings for copper and aluminum conductors based on gauge.
• 12 Volt Systems
  Guides for 12V circuits including amp ratings vs. wire gauge, automotive wiring, and maximum wire length calculations with 2% voltage drop.
• 240 Volt Single-Phase Wiring
  Maximum wire length for 240V single-phase systems with a maximum 2% voltage drop.
• Cross-Section Area Calculator
  Tool for calculating single and bunched electric wire cross-section area and diameter.

Circuit Analysis and Components

• Current Divider Calculator
  Online tool for calculating output current in a parallel circuit branch.
• Circles within a Rectangle Calculator
  Determines the maximum number of circles (pipes or wires) that can fit within a rectangular conduit.
• AC Power Relationships
  Descriptions and formulas for active (real), reactive, and apparent power in AC circuits.
• Capacitor Properties
  Calculators for parallel and serial capacitor circuits, stored energy, and charge.
• Inductor Properties
  Formulas for electrical inductance in serial and parallel connections.
• Dielectric Strength Reference
  Material property describing an insulating material's ability to withstand electric field stress.

Motor Applications

• Asynchronous (Induction) Motors
  Typical electrical properties including nominal current, fuse size, starter ampere, and breaker sizing.
• Motor Efficiency Calculator
  Tool for calculating electric motor efficiency.
• Motor Torque and Power
  Relationships between electric motor output power, torque, and rotation speed.
• IEC and NEMA Torque Standards
  Classification of motor torque characteristics by standard.
• Three-Phase Wiring (230 & 460V)
  Sizing guides for copper wire and transformers for three-phase motors.
• 480 Volt Wiring Data
  NEMA amps, starter size, and HMCP size for motors from 1/2 to 500 hp.
• DC Motor Full-Load Currents
  Full load amperage data for 120V and 240V DC motors.
• Induction Motor Slip
  Explanation of slip as the difference between synchronous and asynchronous speed.

Safety and Standards

• Electric Shocks
  Physiological effects of electric current on the human body.
• NEMA Enclosure Types
  Description of standard electrical enclosure types for environmental protection.
• CE Marking
  Verification that a product meets European safety, health, and environmental requirements under the Machine Directive.
• Electrical Distribution Systems
  Comparison of common systems used in Europe and the USA.

Material Properties and Conversions

• Wire Resistance Data
  Electrical resistance vs. cross-sectional area for aluminum and copper wires, and resistance data for various conductor materials (brass, constantan, nichrome, etc.).
• Conductor Characteristics
  Properties of all-aluminum conductors (AAC).
• AWG Conversions
  Tables converting American Wire Gauge to diameter in mils, circular mils, millimeters, and area in mm².
• Electrical Conductivity
  Reference data on the ability of elements and other materials to conduct electric current.
• Coulomb's Law
  Formula describing the electric force between two point charges.

References

• Original Source