Let us model a circuit with independent and dependent sources in it. The physical meaning of this principle states that nodal voltage of any node in linear electric circuit is an algebraic sum of the voltages that has been produced by each current source, acting alone. The idea of the principle is to determine the mesh current caused by each EMF in the mesh acting alone, and to sum them up. This rule is called superposition principle. The current in any mesh, containing more then one EMF, is an algebraic sum of mesh currents, caused by each EMF acting alone. Ques.In the linear circuit with voltage sources, mesh currents are linear functions of mesh EMFs. The total voltage (V T) = V 1 + V 2 + V 3 + V 4 Thus, by applying the superposition theorem, Very less amount of current flow is detected through a 15Ω resistor because the circuit has a low resistance path. Here, we will use the current division rule as 40Ω and 15Ω resistors are parallel to each other. The voltage through the 15Ω resistor is : Resultant voltage V 4 = V 1 + V 2+ V 3+ V 4īy considering the 20v source separately, the voltage source is short-circuited and the other two sources are open-circuited.īy applying Kirchhoff's voltage law (KVL), the current flowing through a 15Ω resistor is : The different sources = 20v, 10v, 10A, 5A
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