Linear and Non - Linear load : Source of harmonics

Linear loads

• It is a load in which impedance remains constant. The current input is sinusoidal if the applied voltage is sinusoidal.

Non linear loads

Law of Resistance

Resistance

• It is a defined as property of substance which oppose the flow of current through it. 
• The SI unit of resistance is ohm ( Ω ). 

Voltage Source and Current Source

Ideal Voltage Source

• An ideal voltage source is one in which terminal voltage remains constant regardless current flow through its terminals. 
• The ideal voltage source has zero internal resistance.