dependent and independent sources

voltage and current sources

1. SEMINAR DEPENDENT AND INDEPENDENT SOURCES Done by: R.Pravalika Reddy Date:17/9/16

2. IDEAL VOLTAGE SOURCE An  ideal voltage source  is a two-terminal device that maintains a fixed voltage drop across its terminals. It is often used as a mathematical abstraction that simplifies the analysis of real electric circuits Ideal Voltage Source 

3. A  current source  is an electronic circuit that delivers or absorbs an electric current which is independent of the voltage across it. A current source is the dual of a voltage source. Ideal current source  IDEAL CURRENT SOURCE

4. Dependent sources In the theory of electrical networks, a dependent source is a voltage or a current source whose value depends on a voltage or current somewhere else in the network. -- > A simple electric circuit made up of a voltage source and a resistor. Here , V=iR (Ohm’s law)

5. Some voltage (current) sources have their voltage (current) values varying with some other variables. They are called  dependent voltage (current) sources or  controlled  voltage (current) sources.     

6. CLASSIFICATION 1.Voltage-controlled voltage source : The source delivers the  voltage  as per the voltage of the dependent element.   V ={f_{a}}({v_{ x}}) Dependent sources can be classified as follows:

7. 2.Voltage-controlled current source: The source delivers the current as per the voltage of the dependent element.  I={f_{b}}({v_{x}}) 3.Current-controlled current source: The source delivers the current as per the current of the dependent element.  I={f_{c}}({i_{x}})

8. 4.Current-controlled voltage source: The source delivers the voltage as per the current of the dependent element.  V={f_{d}}({i_{x}})

9. An  independent voltage source   maintains a voltage (fixed or varying with time) which is not affected by any other quantity. Similarly an  independent current source   maintains a current (fixed or time-varying) which is unaffected by any other quantity.   INDEPENDENT SOURCES