Page 1 Hong Kong Institute of Vocational Education (Tsing Yi) T&N 3311 Lec 3 Department of Information and Communications Technology Basic DC Electricity.

Slides:



Advertisements
Similar presentations
Current Electricity & Ohm's Law.
Advertisements

Voltage and Current How are electrical potential energy and gravitational potential energy similar? Just as a ball will roll downhill, a negative charge.
Copyright © 2013 The McGraw-Hill Companies, Inc. Permission required for reproduction or display. 1 Chapter 2 Basic Components and Electric Circuits.
What is Electricity? Electricity is the flow of moving electrons. When the electrons flow it is called an electrical current.
Concept Summary Batesville High School Physics. Potential Difference  Charges can “lose” potential energy by moving from a location at high potential.
Current and Resistance
Copyright © 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley Electricity Physics 102 Goderya Chapter(s): 22 and 23 Learning Outcomes:
Current Electricity.
BASIC CONCEPTS System of Units: The SI standard system; prefixes Basic Quantities: Charge, current, voltage, power and energy Circuit Elements.
Electricity and Electrical Circuits. Chapter Sections O 1 - Electrical Circuits O 2 - Current and Voltage O 3 - Resistance and Ohm’s Law.
ElectricitySection 2 Voltage and Current 〉 How are electrical potential energy and gravitational potential energy similar? 〉 Just as a ball will roll downhill,
Do Now What work is required to move 7 coulombs of charge through a potential difference of 3 volts?
EENG 2610: Circuit Analysis Class 1: Basic Concepts, Ohm’s Law
Current Electricity. Current A measure of the flow of charge. Ampere: Electrical measurement of the flow of electrons. 1 Ampere = 1 Coulomb/second. 1.
Electric Current Electrical current is the flow of electrons. Unlike static electricity, charges are in motion. Two types of Current I. Direct current.
Warmup: Concept: OHM’s Law. Electrical current is a measure of the rate at which electrical charge moves in a circuit. Electrical current is measured.
Ch. 34 Electric Current.
 Water boy Water boy  Lightning Lightning  Team work Team work  Ac/Dc Charge Ac/Dc Charge.
Dr. Jie ZouPHY Chapter 21 Electric Current and Direct- Current Circuits.
PHY 2049 Chapter 26 Current and Resistance. Chapter 26 Current and Resistance In this chapter we will introduce the following new concepts: -Electric.
Amps, Volts and Resistance (Ohm’s Law). Coulomb  Recall that one Coulomb has 6.25 X electrons.  If the current coming out of the outlet on the.
4.2.3B Electrical Power What About Watts?. Power Law Moving electrons (current) requires ENERGY How much energy gets used depends on: Strength of push.
(1)A source voltage, that is, an electron pump usually a battery or power supply. [ ENERGY IN] (2) A conductor to carry electrons from and to the voltage.
Current Current: the rate of motion per unit of time.
Page 1 Hong Kong Institute of Vocational Education (Tsing Yi) T&N 3311 Lec 5 Department of Information and Communications Technology Parallel Circuits.
Unit 2 Electrical Quantities and Ohm’s Law. Preview Electricity –Standard set of values Values of electrical measurement –Standardized Understood by everyone.
Chapter 20 Electric Current and Resistance. Units of Chapter 20 Batteries and Direct Current Current and Drift Velocity Resistance and Ohm’s Law Electric.
2 But what makes the electrons flow? Any electrical circuit requires three things 1.A source 2.A load 3.A means of transmission A definition of a current.
Electric Current. Electric Potential Electrons in a circuit have potential energy –The energy is related to the force exerted by an electric field –The.
Energy and Electrostatics. A new definition of potential energy An object has potential energy due to its location within a force field. To change the.
13.2 & Current Definition: Flow of electric charge How many electrons pass a given point each second Water Analogy: Rate at which water flows Units:
Electric Current. In this session we will, Review how we measure electric charge Discuss voltage and electric current Look at electric current in batteries.
Electrical Current Electrical current (measured in amps) is the rate of flow of charge. Electrical current is a flow of electric charge through a medium.
Electric Circuits and terms Electric circuits move charges around to deliver energy.
T By iTutor.comiTutor.com.
 Electrical circuit: a closed loop where charged particles flow  Electrical current: a flow of charged particles (e - )  Direct current (DC): a flow.
The Control of Electricity in Circuits
Electrical Current and Circuits How Electricity Gets To Where It Is Going.
Lectures 7 to 10 The Electric Current and the resistance Electric current and Ohm’s law The Electromotive Force and Internal Resistance Electrical energy.
Electricity on the Move. Current Electricity Unlike static electricity, which does not move except when discharged, current electricity is a continuous.
Page 1 Hong Kong Institute of Vocational Education (Tsing Yi) T&N 3311 Lec 4 Department of Information and Communications Technology Power, Series Circuits,
Electricity. Means a flow of charge (like a water current indicates flow of water) Electric current is based on quantity of charge per second Current.
5.2.2 D.C. Circuits Practical circuits Electromotive force and internal resistance Kirchhoff’s laws Series and parallel arrangements Potential divider.
Unit 2 Electrical Quantities and Ohm’s Law. Objectives After studying this unit, you should be able to: –Define a coulomb –Define an ampere –Define a.
Methods of Charging Conduction – A Charged Object comes in CONtact with a neutral object. – The neutral object takes on the same Net Charge as the Charged.
Electricity and Circuit. Types of Electricity Static Electricity – no motion of free charges Current Electricity – motion of free charges – Direct Current.
Current Resistance Electric Power & Energy. Voltage (V) Electric potential difference between 2 points on a conductor Sometimes described as “electric.
ELECTRICITY WITHIN A CIRCUIT Topic 2. Circuits Electric circuits provide a continuous pathway.
Electric Current. Charge in motion (“flow” of charges). Charge in motion (“flow” of charges). Current: The number of electrons that pass a specific point.
Electric Current Chapter 34.2, 34.4, 34.5, and Notes.
Some Theory Voltage Resistance Current Ohm’s Law
Reformatted for Powerpoint by Megan Maller
Electricity and Circuit
through a conducting metal
Voltage, Current, and Resistance
Ohm’s Law.
Electric Current.
Chapter 6 - Electricity.
VOCABULARY Electric field - the electric force per unit charge; it is radially outward from a positive charge and radially in toward a negative point charge.
Bellwork What is required for electric current to flow?
Electrical Potential Joules units: = Volt = V Coulomb
Topic H: Electrical circuits
Electromotive Force and Current
Electric Potential.
ELECTRIC CIRCUITS.
Electrical Current & Circuits
OMH’S LAW The current flowing through the circuit is directly proportional to the applied voltage an inversely proportional to the resistance of the circuit.
Ohm’s Law & Circuits Chapter 7.2 & 7.3.
Electric Current Chapter 34.
Current and Simple Circuits Voltage Resistance Safety
Presentation transcript:

page 1 Hong Kong Institute of Vocational Education (Tsing Yi) T&N 3311 Lec 3 Department of Information and Communications Technology Basic DC Electricity Basic DC Electricity e OBJECTIVES  Nature of voltage and current  Describe the SI system of measurement  Use power of ten notations  Express electrical units using standard prefix notation such as:  A, kV, mW etc.  Ohms Law

page 2 Hong Kong Institute of Vocational Education (Tsing Yi) T&N 3311 Lec 3 Department of Information and Communications Technology Basic DC Electricity Voltage e Voltage (unit in volts) \ Think of it as a pressure, a driving force to push electrons to drift in a direction i5 volt, 132KV, -12 volt are voltage levels relative to 0 volt i0 volt is typically chosen as the reference voltage level for a system or circuit iThe earth is assumed to be 0 volt. i-5v is as high a voltage as 5v but driving current in an opposite direction

page 3 Hong Kong Institute of Vocational Education (Tsing Yi) T&N 3311 Lec 3 Department of Information and Communications Technology Basic DC Electricity Simple Electrical Circuits 1 All electrical circuits comprise of the following:Source, load, connector

page 4 Hong Kong Institute of Vocational Education (Tsing Yi) T&N 3311 Lec 3 Department of Information and Communications Technology Basic DC Electricity Simple Electrical Circuits 2 e Many physical systems may be modelled using a combination of source and load symbols. The system behaviour may thus be analysed ê To model the behavoiur of the flow of water in a water pipe \ R: size of water pipe \ V: water pump pressure head \ I: water flow rate

page 5 Hong Kong Institute of Vocational Education (Tsing Yi) T&N 3311 Lec 3 Department of Information and Communications Technology Basic DC Electricity Examples of Voltage Source e Battery cell e Laboratory power supply

page 6 Hong Kong Institute of Vocational Education (Tsing Yi) T&N 3311 Lec 3 Department of Information and Communications Technology Basic DC Electricity Current e Current (unit in Ampere) \ It is a rate of flow of electrons per unit time; or a quantitative measure of the charge through a point per second in a closed loop circuit

page 7 Hong Kong Institute of Vocational Education (Tsing Yi) T&N 3311 Lec 3 Department of Information and Communications Technology Basic DC Electricity Resistance e Resistance (unit in Ohms) \ Think of it as a friction, or obstruction index to the flow of electrons \ One Ohm resistance of a conductive medium is equivalent to the need of one Volt voltage pressure to maintain one Ampere current flow in that medium. \ Resistance is a scalar quantity. \ Differentiate Resistor, Conductor and Semiconductor

page 8 Hong Kong Institute of Vocational Education (Tsing Yi) T&N 3311 Lec 3 Department of Information and Communications Technology Basic DC Electricity Definition of Voltage and Current  Definition of Coulomb(C): The coulomb is defined as the charge carried by 6.24 x electron.  Definition of Voltage (volt): e The voltage between two points is one volt if it requires one joule of energy to move one coulomb of charge from one point to another. V = W/Q e Definition of Current (Ampere): e One ampere is the current in a circuit when one coulomb of charge passes a given point in one second I = Q/T

page 9 Hong Kong Institute of Vocational Education (Tsing Yi) T&N 3311 Lec 3 Department of Information and Communications Technology Basic DC Electricity Some SI Base Units

page 10 Hong Kong Institute of Vocational Education (Tsing Yi) T&N 3311 Lec 3 Department of Information and Communications Technology Basic DC Electricity Some SI Derived Units

page 11 Hong Kong Institute of Vocational Education (Tsing Yi) T&N 3311 Lec 3 Department of Information and Communications Technology Basic DC Electricity Conversions

page 12 Hong Kong Institute of Vocational Education (Tsing Yi) T&N 3311 Lec 3 Department of Information and Communications Technology Basic DC Electricity Prefixes

page 13 Hong Kong Institute of Vocational Education (Tsing Yi) T&N 3311 Lec 3 Department of Information and Communications Technology Basic DC Electricity Ohm’s Law 1 e Ohm’s Law:Current in a resistive circuit is directly proportional to its applied voltage and inversely proportional to its resistance. e I = V/R

page 14 Hong Kong Institute of Vocational Education (Tsing Yi) T&N 3311 Lec 3 Department of Information and Communications Technology Basic DC Electricity Ohm’s Law 2 ? What is the differences amongst the following three equations ? \ V=I*R, I=V/R,R=V/I

Feedback: Privacy Policy Feedback
Do Not Sell My Personal Information
About project: SlidePlayer Terms of Service

© 2024 SlidePlayer.com Inc. All rights reserved.