Circuit Analysis
Introduction - Electric circuit theory is one of the fundamental theories upon which all branches of electrical engineering are built. - Many branches of electrical engineering, such as power, electric machines, control, electronics, communications, and instrumentation, are based on electric circuit theory. - In electrical engineering, we are often interested in transferring energy from one point to another. - To do this requires an interconnection of electrical devices. - Such interconnection is referred to as an electric circuit, and each component of the circuit is known as an element. An electric circuit is an interconnection of electric elements.
EE2001 Circuit Analysis
2012/2013
Circuit Theorems
Prepared by John Chan
Email:ecychan@ntu.edu.sg
1
2
- A simple electric circuit is shown in Fig. 1. - It consists of three basic elements: a battery, a lamp, and connecting wires.
- In this course, we are going to learn various analytical techniques for describing the behavior of a circuit like this. - Our major concern is the analysis of circuits, meaning the study of the behavior of the circuit.
Fig. 1. A simple electric circuit.
- A more complicated real circuit is displayed in Fig. 2, representing the schematic diagram for a radio receiver.
Fig. 2. Electric circuit of a radio receiver.
3 4
Basic Concepts Electric charge and Current - Electric charge and its movement are the most basic items of interest in electrical engineering. - The magnitude of the electron’s charge is 1.602 x 10-19 coulomb (unit is C). - A unique feature of electric charge is that it is mobile, meaning it can be transferred from one place to another. - When a conducting wire is connected to a battery, the charge are compelled to move; +ve charges move in one direction and –ve charges move in the opposite direction. - When there is a net flow of charge across any area, we say that there is a current across the area.
Electric current is the time rate of
EE2001 Circuit Analysis
2012/2013
Circuit Theorems
Prepared by John Chan
Email:ecychan@ntu.edu.sg
1
2
- A simple electric circuit is shown in Fig. 1. - It consists of three basic elements: a battery, a lamp, and connecting wires.
- In this course, we are going to learn various analytical techniques for describing the behavior of a circuit like this. - Our major concern is the analysis of circuits, meaning the study of the behavior of the circuit.
Fig. 1. A simple electric circuit.
- A more complicated real circuit is displayed in Fig. 2, representing the schematic diagram for a radio receiver.
Fig. 2. Electric circuit of a radio receiver.
3 4
Basic Concepts Electric charge and Current - Electric charge and its movement are the most basic items of interest in electrical engineering. - The magnitude of the electron’s charge is 1.602 x 10-19 coulomb (unit is C). - A unique feature of electric charge is that it is mobile, meaning it can be transferred from one place to another. - When a conducting wire is connected to a battery, the charge are compelled to move; +ve charges move in one direction and –ve charges move in the opposite direction. - When there is a net flow of charge across any area, we say that there is a current across the area.
Electric current is the time rate of