ENGN1217 Lecture Notes - Lecture 2: Engineering Notation, Electrical Network, Scientific Notation
Lecture 1- Introduction to circuit analysis (ch. 1.2-1.4)
• Electric circuit: interconnection of circuit elements
• Circuit theory is a special case of electromagnetic field theory which deals with the
study of static and moving charges
Key principles:
• Deals with engineering notation
• Abstract —> models help
SI units
• Often SI unit is either too large or too small so powers of 10 are used
Engineering notation
In scientific notation we express a number to the power of 10 with a singe digit to the left
of the decimal point
In engineering notation we express a number only in SI units and three to four number
can be on the left side of the decimal point
Block diagrams
Definition: Used to describe a circuit or system
Used in industry and research papers
Pictorial diagram
• Provide detail
• Help to visualize circuits and their operation by showing components as they actually
look physically
• Cumbersome in some practices
Schematic diagrams
• Use standardized symbols to represent components
• Drawn with horizontal and vertical lines drawn at right angles
Problem solving method
Often problem, situation and goal will be given
PART II: Introduction to current, charge and voltage
• The concept of electrical charge is the basis for describing all electrical phenomena
• Definition: electrical charge (Q) is an electrical property of matter responsible for
electric phenomena, measured in coulombs (C)
• Materials can easily lose or gain electrons e.g. rubbing a glass rod against silk, glass
loses electrons
• Electronic charge e= 1.602 x 10^-19
• One coulomb is the charge on 1.602 x 10^-19 electrons
• A unique feature of electric charge is that it is mobile it can be transferred and
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
1. 2-1. 4: electric circuit: interconnection of circuit elements, circuit theory is a special case of electromagnetic field theory which deals with the study of static and moving charges. Key principles: deals with engineering notation, abstract > models help. Si units: often si unit is either too large or too small so powers of 10 are used. In scientific notation we express a number to the power of 10 with a singe digit to the left of the decimal point. In engineering notation we express a number only in si units and three to four number can be on the left side of the decimal point. Definition: used to describe a circuit or system. Pictorial diagram: provide detail, help to visualize circuits and their operation by showing components as they actually look physically, cumbersome in some practices. Schematic diagrams: use standardized symbols to represent components, drawn with horizontal and vertical lines drawn at right angles.
