OpenEnergyMonitor
  • System Overview
  • Resources
  • Troubleshooting

Hardware:

  • emonTx4
  • emonTx3
  • emonTH2
  • emonPi
  • emonBase
  • EmonEVSE

Software:

  • emonSD
  • emonHub
  • emonCMS

Applications:

  • Home Energy
  • Solar PV
  • Heat pump

Learn:

  • Electricity Monitoring
    • AC Power Theory
      • An Introduction to AC Power
      • AC Power Theory - Arduino Maths
      • AC Power Theory - Advanced Maths
      • 3-Phase Power
      • Use in North America
    • CT Sensors
    • Voltage Sensing
    • Current and Voltage
    • Networking
    • Pulse Counting
    • Temperature
    • Using the Arduino IDE
    • Using PlatformIO
    • Programmers
  • Heat pumps
  • Sustainable Energy
  • PV Diversion
OpenEnergyMonitor
  • Learn: Electricity Monitoring
  • AC Power Theory
  • View page source

AC Power Theory

  • An Introduction to AC Power
    • Understanding AC Power
    • Resistive Loads
    • Partially Reactive Loads
    • Real Power, Reactive Power and Apparent Power
    • Determining the Direction of Power Flow
    • To Sum Up
    • Further Reading
  • AC Power Theory - Arduino Maths
    • Instantaneous Voltage and Current
    • Calculating Real Power on an Arduino
    • Root-Mean-Square (RMS) – Voltage
    • Root-Mean-Square (RMS) – Current
    • Apparent Power
    • Power Factor
    • EmonLib
  • AC Power Theory - Advanced Maths
    • Real Power
    • RMS Voltage and Current Measurement
    • Apparent Power and Power Factor
    • Harmonics, Non-Linear Loads and Power Factor
    • Adding RMS Values
    • References
  • 3-Phase Power
    • History
    • What is 3-Phase Power?
    • Naming
    • Identifying a 3-Phase Supply
    • Mathematics of a 3-Phase Supply
    • Effect of Unbalanced Loads
    • Measuring 3-Phase Power
    • An Approximate Method to Estimate 3-Phase Power with an Unmodified emonTx
    • Dangers
  • Use in North America
    • Supply Characteristics – UK
    • Supply Characteristics – North America
    • Measuring Whole-house Power
    • Measuring Individual Circuits
    • Connecting the Current Transformers
    • Suitable Current Transformers
    • Magnelab solid core series
    • Magnelab split core series
    • Wattcore split core series
    • Continental Control Systems - ACT-0750 Series Split-Core Current Transformers
    • YHDC 100A/200A/400A Split core current transformer SCT023R
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