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Which of the following is not bilateral element?

Which of the following is not bilateral element? Correct Answer Constant current source

The constant current source is a unilateral element because it flows only in one direction as shown,

Additional Information

In network theory elements can be classified in the following way: 

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1. Linear and Non-linear Element:

  • An element is said to be Linear if its V-I characteristics follow only one equation of the straight line or Ohm's law and passing through the origin.
  • R, L and C element is considered as the linear element.
  • The characteristics of the linear element are shown below.

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  • An element is said to be Non-linear if its V-I characteristics not follow only one equation and not follow Ohm's law.
  • Diode, BJT, JFET, SCR, etc are considered as the non-linear element.
  • The characteristics of the non-linear element are shown below.

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2. Active and Passive Element:

  • The element which delivers power from the source to load is called the Active element.
  • Generator, Solar cell, battery, etc are examples of Active elements.
  • For active elements, the slope of characteristics is either only negative or both negative and positive as shown.

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  • The element that absorbed power or dissipates power from the source is known as the Passive element.
  • R, L, C is an example of a Passive element.
  • For the passive element, the slope of characteristics is only positive as shown.

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3. Unilateral and Bilateral Element:

  • An element is said to be Unilateral if the flowing of current through the element is only one direction or current flows through it due to the majority carrier only.
  • Diode, FET, BJT, etc is an example of a unilateral element.
  • An element is said to be Bilateral if it offers the same impedance in characteristics.
  • R, L, C is an example of a Bilateral element and each Linear element is Bilateral in nature.
     

4. Time-variant and Time-invariant Element: An element is said to be a time-variant if its V-I characteristics change with time, otherwise, it is time-invariant.

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