Docsity
Log inSign up
Docsity
Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity

Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan

Guidelines and tips
Guidelines and tips
Sell on Docsity
Sell on Docsity
Log inSign up

Prepare for your exams

Study with the several resources on Docsity

Find documents

Prepare for your exams with the study notes shared by other students like you on Docsity

Search Store documents

The best documents sold by students who completed their studies

Search through all study resources
Docsity AINEW

Summarize your documents, ask them questions, convert them into quizzes and concept maps

Explore questions

Clear up your doubts by reading the answers to questions asked by your fellow students

Earn points to download

Earn points by helping other students or get them with a premium plan

Share documents
download point icon20 Points

For each uploaded document

Answer questions
download point icon5 Points

For each given answer (max 1 per day)

All the ways to get free points
Get points immediately

Choose a premium plan with all the points you need

Study Opportunities

Choose your next study program

Get in touch with the best universities in the world. Search through thousands of universities and official partners

Community

Ask the community

Ask the community for help and clear up your study doubts

University Rankings

Discover the best universities in your country according to Docsity users

Free resources

Our save-the-student-ebooks!

Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors

From our blog

Exams and Study
Go to the blog

Electrical Current Formulas, Study notes of Electrical Engineering

Gujarat Technological UniversityElectrical Engineering

Electrical Current Formulas and Solved examples step by step Procedure

Typology: Study notes

2020/2021

Available from 11/09/2021

next-generation-e-technology
next-generation-e-technology 🇮🇳

1 document

1 / 4

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
Electrical Current Formulas
Electrical Current Formulas in DC Circuit
I = V/R
I = P/V
I = √P/R
Electrical Current Formulas in Single Phase AC Circuit
I = P / (V x Cosθ)
I = (V/Z)
Electrical Current Formulas in Three Phase AC Circuit
I = P / √3 x V x Cosθ
Voltage or Electrical Potential Formulas
Electrical Potential or Voltage Formula in DC Circuits
V = I x R
V = P / I
V = √ (P x R)
Voltage or Electrical Potential Formulas in Single Phase AC Circuits
V = P/(I x Cosθ)
V = I x Z
Voltage Formulas in Three Phase AC Circuits
V L= √3 VPHor VL= √3 EPH  …  [Star Connection]
V L= VPH  …  [Delta Connection]
Electric Power Formulas
Power Formulas in DC Circuits
P = V x I
P = I2
x R
P = V2
/R
Power Formulas in Single Phase AC Circuits
P = V x I Cosθ
P = I2
x R Cosθ
P = (V2
/R) Cosθ
Power Formulas in Three Phase AC Circuits
P = √3 x VLx ILCosθ
P = 3 x VPx IPCosθ
Electrical Resistance Formulas
Electrical Resistance & Impedance Formulas in DC Circuits
R = V/I
R = P/I2
R = V2
/P
Electrical Resistance & Impedance Formulas in AC Circuits
In AC Circuits (capacitive or inductive load), Resistance = Impedance i.e., R = Z
pf3
pf4

Partial preview of the text

Download Electrical Current Formulas and more Study notes Electrical Engineering in PDF only on Docsity!

Electrical Current Formulas

Electrical Current Formulas in DC Circuit  I = V/R  I = P/V  I = √P/R Electrical Current Formulas in Single Phase AC Circuit  I = P / (V x Cosθ)  I = (V/Z) Electrical Current Formulas in Three Phase AC Circuit  I = P / √3 x V x Cosθ

Voltage or Electrical Potential Formulas

Electrical Potential or Voltage Formula in DC Circuits  V = I x R  V = P / I  V = √ (P x R) Voltage or Electrical Potential Formulas in Single Phase AC Circuits  V = P/(I x Cosθ)  V = I x Z Voltage Formulas in Three Phase AC Circuits  VL = √3 VPH or VL = √3 EPH … [Star Connection]  VL = VPH … [Delta Connection]

Electric Power Formulas

Power Formulas in DC Circuits  P = V x I  P = I^2 x R  P = V^2 /R Power Formulas in Single Phase AC Circuits  P = V x I Cosθ  P = I^2 x R Cosθ  P = (V^2 /R) Cosθ Power Formulas in Three Phase AC Circuits  P = √3 x VL x IL Cosθ  P = 3 x VP x IP Cosθ

Electrical Resistance Formulas

Electrical Resistance & Impedance Formulas in DC Circuits  R = V/I  R = P/I^2  R = V^2 /P Electrical Resistance & Impedance Formulas in AC Circuits In AC Circuits (capacitive or inductive load), Resistance = Impedance i.e., R = Z

 Z^2 = R^2 + X^2 … In case of resistance and reactance  Z = √(R^2 + XL^2 ) … In case of Inductive load  Z = √(R^2 + XC^2 ) … In case of Capacitive load  Z = √(R^2 + (XL– XC)^2 … In case of both inductive and capacitive loads. Impedance is the resistance of AC circuits i.e. resistive, captative and inductive circuit (already mentioned above). Where “Z” is the impedance in ohms, “R” is resistance in Ohms and “X” is the reactances in Ohms. Good to know:  I = Current in Amperes (A)  V = Voltage in Volts (V)  P = Power in Watts (W)  R = Resistance in Ohm (Ω)  Z = impedance = Resistance of AC Circuits in Ohms  Cosθ = Power factor = Phase difference between voltage and current in AC circuits  VPH = Phase Voltage  VL = Line Voltage Also, XL = Inductive reactance XL = 2π f L…Where L = Inductance in Henry And; XC = Capacitive reactance XC = 1/2π f C… Where C = Capacitance in Farads. Also, ω = 2 π f [/box] The following table shows the current, voltage, power and resistance equations and formulas in DC and 1-Φ & 3-Φ AC circuits. Quantity DC Single Phase AC Three Phase AC Current (I)

 I = V/R

 I = P/V

 I = √P/R

 I = P / (V x Cosθ)  I = (V/Z)  I = P / √3 x V x Cosθ

Where “Q” is the charge in coulombs, “C” is the capacitance in farads and “V” is the voltage in Volts. Frequency: f = 1 / T Time Period T = 1 / f Where “ f ” is frequency in Hertz (Hz) and “T” is the time periods in seconds.