Basic Electrical Engineering (3110005)

BE | Semester-1   Winter-2019 | 11-01-2020

Q3) (b)

Draw impedance triangle, Voltage triangle, Power triangle for single phase R-L series circuit.

From Eq. ( 1 )
 
V = VR2 + VL2  
 
V =  IR 2 +  IXL 2  
 
V =I R2 + XL2  
 
V = I Z
 
Where, Z =  R2 + XL2  
 
From Eq. ( 2 )
 
Z =  R2 + XL2  
 
ϕ = tan-1  XL R 
 
From Eq. ( 3 )Q = V I sin ϕ = I2 XL
 
Real Power, P = V I cos ϕ = I2 R
 
Reactive Power, Q = V I sin ϕ = I2 XL
 
Apparant Power, S = V I = I2 Z