fbpx
Breaking News
Home » AC Fundamentals » Power Formulas in DC, AC Single Phase & Three Phase Circuits.

Power Formulas in DC, AC Single Phase & Three Phase Circuits.

Power Formulas in DC, AC Single Phase and AC Three Phase Circuits

Back to basic, below are the simple Power formulas for Single Phase AC Circuit, Three Phase AC Circuits and DC Circuits. You can easily find electric power in watts by using the following power formulas in electric circuits.

Power Formulas in DC Circuits

  • P = V x I
  • P = I2 x R
  • P = V2 / R

Where:

P = Power in Watts

V = Voltage in Volts

I = Current in Amperes

R = Resistance in Ohms (Ω)

Power Formulas in Single Phase AC Circuits

  • P = V x I x Cos Ф
  • P = I2 x R x Cos Ф
  • P = V2 / 2 (Cos Ф)

Where:

P = Power in Watts

V = Voltage in Volts

I = Current in Amperes

R = Resistance in Ohms (Ω)

Cos Ф = Power Factor

Power Formulas in Three Phase AC Circuits

  • P = √3 x VL x IL x Cos Ф
  • P = 3 x VPh x IPh x Cos Ф
  • P = 3 x I2 x R x Cos Ф
  • P = 3 (V2 / R) x Cos Ф

Where:

P = Power in Watts

V = Voltage in Volts

I = Current in Amperes

R = Resistance in Ohms (Ω)

Cos Ф = Power Factor

Click image to enlarge

Power Formulas in DC, AC Single Phase and AC Three Phase Circuits

You may also read:

JLCPCB - Prototype PCBs for $2 + Free Shipping on First Order
China's Largest PCB Prototype Manufacturer, with 290,000+ Customers & 8,000+ Orders Per Day
10 PCBs Price: $2 for 2-layer, $15 for 4-layer, $74 for 6-layer

About Electrical Technology

All about Electrical & Electronics Engineering & Technology. Follow , Facebook , Twitter , Instagram, Pinterest, YouTube, & Linkedin to get the latest updates or subscribe Here to get latest Engineering Articles in your mailbox.

Check Also

What Is Fuzzy Logic System

What is Fuzzy Logic System – Operation, Examples, Advantages & Applications

What is Fuzzy Logic System? Introduction to Fuzzy Logic Fuzzy Logic is a logic or …

12 comments

  1. sir i want to know in detail about KVA

  2. The main reason is they don&#39;t stick long enough with a <br />new, good program. Many people are not really encouraged to do workouts if they are just in the gym listening to music or <br />watching TV as they walk away their fat in a treadmill.<br />These can be prepared in a healthy and satisfying way that will leave your stomach all fuzzy and warm.<br /><br /><br />Here is my web site – <a

  3. can you tell me about load calculation and size of wire depending on load

  4. Dear sir,
    i want to know about contactor relays its types rating wiring could you please help me in this matter.

  5. sir i want to know about single phase circuit. pls help me.

  6. dear i want to know about, why we rated prim-mover in MW (Mega-Watt) while our Generator rated in KVA………please tell me>.

  7. In 45 kw ac drive, output motor consumes 30kw, then another how much dc current use in dc bus.
    Means what is the formula od dc current.

    Please help….

  8. Formula P=(I^2)*(R)*Cos(A) is wrong. Currect answer is P=(I^2)*R.

    P=3*(I^2)*(R)*Cos(A) is wrong. Currect answer is P=3*(I^2)*R.

Leave a Reply

Your email address will not be published. Required fields are marked *