Lecture - 14 Current Source.pdf - Google Drive

0 downloads 2 Views 506KB Size Report
circuits are more easily analysed using one particular. approach. The advantages of each method will be. discussed in th
Fundamentals of Electrical Engineering Lecture – 14 Mamoon Riaz

Methods of Analysis

• The networks we have worked with so far have generally had a single voltage source and could be easily analysed using techniques such as Kirchhoff’s voltage law and Kirchhoff’s current law. In the coming lectures, you will examine circuits that have more than one voltage source or that cannot be easily analysed using techniques studied in previous lectures. The methods used in determining the operation of complex networks will include branch current analysis, mesh (or loop) analysis, and nodal analysis. Although any of the above methods may be used, you will find that certain circuits are more easily analysed using one particular approach. The advantages of each method will be discussed in the appropriate lectures at later time. Mamoon Riaz, Department of Electrical Engineering, HITEC University

2

Constant-Current Sources • A current source maintains the same current in its branch of the circuit regardless of how components are connected externally to the source. The symbol for a constant-current source is shown in Figure

Mamoon Riaz, Department of Electrical Engineering, HITEC University

3

Constant-Current Sources • The direction of the current source arrow indicates the direction of conventional current in the branch.

Mamoon Riaz, Department of Electrical Engineering, HITEC University

4

Constant Current Sources (Example) • Calculate the voltage across the current source if the resistor is 100 Ω. • Calculate the voltage if the resistor is 2 kΩ.

Mamoon Riaz, Department of Electrical Engineering, HITEC University

5

Constant Current Sources (Example) • Determine the voltages across each resistor and the source voltage and source current for the circuit shown in figure.

Mamoon Riaz, Department of Electrical Engineering, HITEC University

6

Constant Current Sources (Example) • Determine the currents and the source voltage and for the circuit shown in figure. (Part of Assignment – 1)

Mamoon Riaz, Department of Electrical Engineering, HITEC University

7

Constant Current Sources (Example) • Find the current 𝐼3 and voltages 𝑉𝑆 and 𝑉1 .

Mamoon Riaz, Department of Electrical Engineering, HITEC University

8