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Introduction to Electrical Engineering - PowerPoint PPT Presentation

ECE 3710 E: Circuits and Electronics. Jeff Dugger. Lecture 1: 08/22/00. Communication. Computation. Control. Power. Introduction to Electrical Engineering. 5. 4. 3. 2. 1. 0. t. t. t 1. t n. The Sound of Music. Analog: Record Player. Digital: Compact Disc Player.

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Presentation Transcript

Jeff Dugger

Lecture 1: 08/22/00

Computation

Control

Power

Introduction to Electrical Engineering

4

3

2

1

0

t

t

t1

tn

The Sound of Music

Analog: Record Player

Digital: Compact Disc Player

1, 1, 2, 2, 2, 4, 4, 3, 2, 1

Force = mass X acceleration

m1

m2

+q1

-q2

-q1

-q2

Mass and Charge

Property: Mass Force: Gravity

Property: Charge Force: Electrostatic

TWO TYPES OF CHARGE:

+ AND -

r

+q

-q

Force Fields

G-Field

E-Field

-Q

ME

ME >> m1

|Q | >> |q|

+q

-q

Potential Energy

G-Field

E-Field

+ P

+ V

0

0

- P

- V

-Q

ME

Important to define a REFERENCE!

-I

+I

+

CD Player

-

kilograms / second

Coulombs / second (Amperes)

1 m/s

The rate at which work gets done.

2 m/s

• Charge is a fundamental property of matter.

• Two types of charge: positive and negative.

• Like charges repel, unlike charges attract.

• Voltageprovides potential for charges to flow.

• Current measures number of charges flowing by in a given time interval.

• Power is the rate of energy per time required to move a charge or released by a moving charge.

• Circuits are “plumbing for charges”, physical systems for controlling charge flow.

• Electrical Engineers design circuits to store and move charge to represent information and to do work.