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CONCORDIA UNIVERSITY / OTHER / ELEC 273 / What is the function of the ohm's law?

What is the function of the ohm's law?

What is the function of the ohm's law?

Description

School: Concordia University
Department: OTHER
Course: BASIC CIRCUIT ANALYSIS
Term: Fall 2019
Tags: elec, 273, electricity, Circuits, basic, concepts, laws, and analysis
Cost: 50
Name: ELEC273, STUDY GUIDE
Description: Chapter 1: Basic concepts, Chapter 2: Basic laws, Chapter 3: Method analysis
Uploaded: 09/30/2019
19 Pages 30 Views 1 Unlocks
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Chapter 1: Basic Concepts We also discuss several other topics like What is the study of mankind?

We also discuss several other topics like Why classical mechanics doesn't describe electromagnetic radiation?

1.1: Introduction:We also discuss several other topics like What term refers to increasing understanding of one’s own use of language?

Electric circuit - it is an interconnection of electrical elements

1.2 UnitsIf you want to learn more check out Who is the proponent of the schema theory?

Basic SI units (international system (SI))

Quantity

Basic unit

Symbol

length

meter

M

mass

kilogram

Kg

time

second

s

Electric current

ampere

A

Thermodynamic temp

kelvin

K

Luminous intensity

candela

cd

charge

coulomb

C

We also discuss several other topics like What affects a person's metabolic rate?

SI prefixes

multiplier

prefix

symbol

giga

G

mega

M

kilo

𝑘

hecto

h

deka

da

deci

d

centi

c

milli

m

micro

µ

nano

n

pico

p

1.3  Charge and current:Don't forget about the age old question of Describe the difference between chloroplasts and mitochondria?

Charge - it is an electrical property of the anatomic particles of which matter consists, measured in coulombs (C)

1 electron’s charge = 1,602 x C

1 proton’s charge = 1,602 x C

Law of conservation of charge: charge can neither be created nor destroyed

  • So the algebraic sum of the electric charges in a system does not change

Current flow:

Current flows from the + to the  -

* if it flows in the other side, it’s negative

Electric current: it is the time rate of change of charge, measured in amperes (A)

1A = 1

i = → Q =

Direct current (dc): flows only in one direction and can be constant or time varying

Alternative current (ac): a current that charges direction with respect to time.

1.4. Voltage:

Voltage (or potential difference) - Voltage between two points a and b in an electric circuit is the energy (or work) needed to move a unit of charge from b to a (point (-) to point (+)

=  

  • V = Voltage (in volts, V)
  • w = energy (in joules, J)
  • q = charge (in coulombs, C)

1V = 1= 1

1.5 Power and Energy:

Power: Time rate of expanding or absorbing energy, watts (W)

P= . =  P= V.I

Energy - the capacity to do work, measured in joules (J)

Power sum = 0                + power absorbed = - power supplied

⅀p = 0                                        ↳ power low

1.6 Circuit elements:

Passive elements - can’t generate energy ( resistors, capacitors, and inductors)

Active elements - can generate energy ( generators, batteries, operational amplifiers)

Ideal independent source - it’s an active source that provides a specified voltage or current that     is completely independent of other circuits elements

          ↓

    symbols

Ideal dependent (or controlled) source: it’s an active element in which the source quantity is controlled by another voltage or current

4 Types of Ideal Dependent (or Controlled) source

  1. Voltage -controlled voltage source (VCVS)

Amplifier ←

  1. Current - controlled voltage source (CCVS)

        

        → voltage will remain proportional to the current controlling

  1. Voltage - controlled current source (VCCS)

        → G has units

  1. Current - controlled current source (CCCS)

Chapter 2: Basic laws

2.2 Ohm’s law:

R = p         A: Area, l= length,  p= resistivity

Resistance R: the resistance of an element denotes its ability to resist the flow of electric current; it is measured in ohms (Ω)

R =                           1Ω=  

Ohm’s law: it states that the voltage ℧ across a resistor is directly proportional to the current; that flows through the resistor

℧ = i.R                v ∞ i

*If currents flows from higher potential (+) to lower potential (-)

→ V= iR

*If currents flows from lower potential (-) to higher potential (+)

→ V= -iR

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