Chapter 4 Circuit Theorems: Linearity & Superposition
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1 Chapter 4 Circuit Theorems: Linearity & Superposition Dr. Waleed Al-Hanafy waleed alhanafy@yahoo.com Faculty of Electronic Engineering, Menoufia Univ., Egypt MSA Summer Course: Electric Circuit Analysis I (ESE 233) Lecture no. 6 July 31, 2011
2 Overview 1 Linearity Property 2 Superposition Principle 3 Conclusions Reference: [1] Alexander Sadiku, Fundamentals of Electric Circuits, 4th ed. McGraw-Hill, 2009.
3 Introduction Linearity is the property of an element describing a linear relationship between cause and effect The property is a combination of both the homogeneity (scaling) property and the additivity property The homogeneity property requires that if the input (also called the excitation) is multiplied by a constant, then the output (also called the response) is multiplied by the same constant if v = ir kv = kir The additivity property requires that the response to a sum of inputs is the sum of the responses to each input applied separately v 1 = i 1R, v 2 = i 2R v = (i 1 + i 2)R = v 1 + v 2 We say that a resistor is a linear element because the voltage-current relationship satisfies both the homogeneity and the additivity properties
4 Linear Circuit A linear circuit is one whose output is linearly related (or directly proportional) to its input Since power is defined as p = i 2 R = v 2 /R, is not a linear function, therefore, the theorems covered in this chapter are not applicable to power
5 Example 1 For the circuit shown, find v 0 when i s = 15 and i s = 30 A Answer: 10 V, 20 V
6 Example 2 Assume I 0 = 1 A and use linearity to find the actual value of I 0 in the circuit shown Answer I 0 = 3 A
7 Superposition Principle The superposition principle states that the voltage across (or current through) an element in a linear circuit is the algebraic sum of the voltages across (or currents through) that element due to each independent source acting alone. to apply the superposition principle, we must keep two things in mind: 1 We consider one independent source at a time while all other independent sources are turned off. This implies that we replace every voltage source by 0 V (or a short circuit), and every current source by 0 A (or an open circuit). This way we obtain a simpler and more manageable circuit 2 Dependent sources are left intact because they are controlled by circuit variables
8 Superposition Principle (cont d) Steps to Apply Superposition Principle: 1 Turn off all independent sources except one source. Find the output (voltage or current) due to that active source using nodal or mesh analysis 2 Repeat step 1 for each of the other independent sources 3 Find the total contribution by adding algebraically all the contributions due to the independent sources Disadvantages: 1 More work is very likely involved. However, superposition does help reduce a complex circuit to simpler circuits through replacement of voltage sources by short circuits and of current sources by open circuits 2 Keep in mind that superposition is based on linearity. For this reason, it is not applicable to the effect on power due to each source
9 Examples Using the superposition theorem, find v 0 in the circuit shown Answer: 12 V Find i in the circuit shown using the superposition principle Answer: 0.75 A
10 Conclusions Concluding remarks Linearity property is discussed Superposition principle has been studied highlighted by some examples.
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