Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

This is an AMP page - Open full page! for all features.

Single and Three Phase AC - Electric Current vs. Power

Sponsored Links

In a single-phase AC power system there is only one single sinusoidal voltage.

Most AC power is produced and distributed as three-phase power with three sinusoidal voltages 120 degrees out of phase with each other.

The diagram and table below can be used to convert amperage between single phase and three phase equipment and vice versa.

Download and print Single Phase and Three Phase AC Power Chart

Example - Power Supply to Electric Heater

10 kW of power is required by an electric heater. The power supply available is 230V single or three phase. From the chart above we can estimate the current in the two alternatives to be approximately

  • 43 A with single phase 230V
  • 25 A with three phase 230V
.

Apparent Power is the power supplied to the electric circuit - typical from a power supplier to the grid - to cover the real and reactive power consumption in the loads. For pure resistive loads apparent power is equal to real power and 1 VA = 1 W.

For full table with Three Phase Balanced Loads - rotate the screen!

Single and Three Phase AC - Electric Current vs. Power
Apparent Power
(VA)		Current (amps)
Single Phase (volts)Three Phase Balanced Load (volts)
120208230240208230240277347380400415480600
100 0.83 0.48 0.43 0.42 0.28 0.25 0.24 0.21 0.17 0.15 0.14 0.14 0.12 0.10
150 1.3 0.72 0.65 0.63 0.42 0.38 0.36 0.31 0.25 0.23 0.22 0.21 0.18 0.14
200 1.7 1.0 0.87 0.83 0.56 0.50 0.48 0.42 0.33 0.30 0.29 0.28 0.24 0.19
250 2.1 1.2 1.1 1.0 0.69 0.63 0.60 0.52 0.42 0.38 0.36 0.35 0.30 0.24
300 2.5 1.4 1.3 1.3 0.83 0.75 0.72 0.63 0.50 0.46 0.43 0.42 0.36 0.29
350 2.9 1.7 1.5 1.5 1.0 0.88 0.84 0.73 0.58 0.53 0.51 0.49 0.42 0.34
400 3.3 1.9 1.7 1.7 1.1 1.0 1.0 0.83 0.67 0.61 0.58 0.56 0.48 0.38
450 3.8 2.2 2.0 1.9 1.2 1.1 1.1 0.94 0.75 0.68 0.65 0.63 0.54 0.43
500 4.2 2.4 2.2 2.1 1.4 1.3 1.2 1.0 0.83 0.76 0.72 0.70 0.60 0.48
550 4.6 2.6 2.4 2.3 1.5 1.4 1.3 1.1 0.92 0.84 0.79 0.77 0.66 0.53
600 5.0 2.9 2.6 2.5 1.7 1.5 1.4 1.3 1.0 0.91 0.87 0.83 0.72 0.58
650 5.4 3.1 2.8 2.7 1.8 1.6 1.6 1.4 1.1 1.0 0.94 0.90 0.78 0.63
700 5.8 3.4 3.0 2.9 1.9 1.8 1.7 1.5 1.2 1.1 1.0 1.0 0.84 0.67
750 6.3 3.6 3.3 3.1 2.1 1.9 1.8 1.6 1.2 1.1 1.1 1.0 0.90 0.72
800 6.7 3.8 3.5 3.3 2.2 2.0 1.9 1.7 1.3 1.2 1.2 1.1 1.0 0.77
850 7.1 4.1 3.7 3.5 2.4 2.1 2.0 1.8 1.4 1.3 1.2 1.2 1.0 0.82
900 7.5 4.3 3.9 3.8 2.5 2.3 2.2 1.9 1.5 1.4 1.3 1.3 1.1 0.87
950 7.9 4.6 4.1 4.0 2.6 2.4 2.3 2.0 1.6 1.4 1.4 1.3 1.1 0.91
1000 8.3 4.8 4.3 4.2 2.8 2.5 2.4 2.1 1.7 1.5 1.4 1.4 1.2 1.0
1100 9.2 5.3 4.8 4.6 3.1 2.8 2.6 2.3 1.8 1.7 1.6 1.5 1.3 1.1
1200 10 5.8 5.2 5.0 3.3 3.0 2.9 2.5 2.0 1.8 1.7 1.7 1.4 1.2
1300 11 6.3 5.7 5.4 3.6 3.3 3.1 2.7 2.2 2.0 1.9 1.8 1.6 1.3
1400 12 6.7 6.1 5.8 3.9 3.5 3.4 2.9 2.3 2.1 2.0 1.9 1.7 1.3
1500 13 7.2 6.5 6.3 4.2 3.8 3.6 3.1 2.5 2.3 2.2 2.1 1.8 1.4
1600 13 7.7 7.0 6.7 4.4 4.0 3.8 3.3 2.7 2.4 2.3 2.2 1.9 1.5
1700 14 8.2 7.4 7.1 4.7 4.3 4.1 3.5 2.8 2.6 2.5 2.4 2.0 1.6
1800 15 8.7 7.8 7.5 5.0 4.5 4.3 3.8 3.0 2.7 2.6 2.5 2.2 1.7
1900 16 9.1 8.3 7.9 5.3 4.8 4.6 4.0 3.2 2.9 2.7 2.6 2.3 1.8
2000 17 9.6 8.7 8.3 5.6 5.0 4.8 4.2 3.3 3.0 2.9 2.8 2.4 1.9
2500 21 12 11 10 6.9 6.3 6.0 5.2 4.2 3.8 3.6 3.5 3.0 2.4
3000 25 14 13 13 8.3 7.5 7.2 6.3 5.0 4.6 4.3 4.2 3.6 2.9
3500 29 17 15 15 9.7 8.8 8.4 7.3 5.8 5.3 5.1 4.9 4.2 3.4
4000 33 19 17 17 11 10 9.6 8.3 6.7 6.1 5.8 5.6 4.8 3.8
4500 38 22 20 19 12 11 11 9.4 7.5 6.8 6.5 6.3 5.4 4.3
5000 42 24 22 21 14 13 12 10 8.3 7.6 7.2 7.0 6.0 4.8
5500 46 26 24 23 15 14 13 11 9.2 8.4 7.9 7.7 6.6 5.3
6000 50 29 26 25 17 15 14 13 10 9.1 8.7 8.3 7.2 5.8
6500 54 31 28 27 18 16 16 14 11 9.9 9.4 9.0 7.8 6.3
7000 58 34 30 29 19 18 17 15 12 11 10 9.7 8.4 6.7
7500 63 36 33 31 21 19 18 16 12 11 11 10 9.0 7.2
8000 67 38 35 33 22 20 19 17 13 12 12 11 9.6 7.7
8500 71 41 37 35 24 21 20 18 14 13 12 12 10 8.2
9000 75 43 39 38 25 23 22 19 15 14 13 13 11 8.7
9500 79 46 41 40 26 24 23 20 16 14 14 13 11 9.1
10000 83 48 43 42 28 25 24 21 17 15 14 14 12 9.6
Sponsored Links

Related Topics

• Electrical

Electrical engineering with units, amps and electrical wiring. Wire gauges, electrical formulas, motors and more.

Related Documents

AC - Active, Reactive and Apparent Power

Real, imaginary and apparent power in AC circuits.

AC Circuits - Power vs. Voltage and Current

The alternating current In an AC circuit is generated by a sinusoidal voltage source.

Aluminum Conductor Characteristics

Characteristics of all-aluminum conductors (AAC).

Asynchronous Induction Motors - Electrical Properties

Typical electrical motor data like nominal current, fuse, start ampere, size of contactor and circuit breaker - for asynchronous induction motors.

Electrical Formulas

Commonly used electrical formulas like Ohms Law and more.

Electrical Units

Definition of common electrical units - like Ampere, Volt, Ohm, Siemens.

Electrical Vehicle Charging - Power vs. Voltage and Amps

EV Charging - AC vs. DC, single phase vs. three phase and power vs. voltage and amps.

Single Phase Power Equations

Power equations for single phased electrical systems.

Sponsored Links

Search Engineering ToolBox

  • the most efficient way to navigate the Engineering ToolBox!

SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.