Electrical Resistance

Slides:

Advertisements

Similar presentations

Advertisements

Chapter 17: Introduction to Electricity Review. a)law of electric charges (like charges repel and opposite charges attract) b)electric force (the force.

Discussion D2.1 Chapter 2 Sections 2-1 – 2-6, 2-10

Circuit elements Resistors Resistance The electrical resistance of a circuit component or device is defined as the ratio of the voltage applied to the.

ECE 2011 Resistance and Ohm’s Law. ECE 2012 Resistance and Ohm’s Law The ability of materials to oppose the flow of electric charges is known as resistance.

Chapter 13 Electricity!. Quick review: Conductors Insulators Like charges ___________ and unlike charges _____________. Repel Attract.

Objective of Lecture Explain mathematically how resistors in series are combined and their equivalent resistance. Chapter 2.5 Explain mathematically how.

Current Electricity, Ohm’s Law & Circuits. Current (I) The rate of flow of charges through a conductor Needs a complete closed conducting path to flow.

Ohm’s Law The most important fundamental law in electronics is Ohm’s law, which relates voltage, current, and resistance. Georg Simon Ohm ( ) studied.

Resistance in Electrical Systems

4.3 Notes Resistance in Electrical Systems. Properties of Materials Conductors Have a large ability to conduct electric current They contain many free.

Plan What is a resistor? What is a resistor?resistor How can we measure the resistance? How can we measure the resistance?resistance Ohm s Law. Ohm s Law.Law.

CHAPTER 7 ELECTRICITY BINGO. A circuit in which current has more than one path is called a _________________ circuit.

10 pt 15 pt 20 pt 25 pt 5 pt 10 pt 15 pt 20 pt 25 pt 5 pt 10 pt 15 pt 20 pt 25 pt 5 pt 10 pt 15 pt 20 pt 25 pt 5 pt 10 pt 15 pt 20 pt 25 pt 5 pt.

Electrical resistance Resistance measures how difficult it is for current to flow.

Chapter 4.3 Notes Resistance in Electricity. Charges can easily flow through conductors because they contain many free electrons. Charges can easily flow.

Resistance in Electrical Systems Chap 4.3. Objectives Explain the difference between conductors, insulators & semiconductors. Define electrical resistance.

Concurrent Assessment DC Electronics 1 1.When you have a complete series circuit, is the current flow the same at every place in the circuit? 2.What is.

Section 2: Series and Parallel Circuits. Series Circuits Picture of Series Circuit:Properties: 1)Current: 2) Voltage: 3) Equivalent Resistance:

Series and Parallel Circuits How to find the resultant resistance of an electronic circuit.

The Math for Ohms Law along in DC Circuits

EE2010 Fundamentals of Electric Circuits

CH-20: Electric Circuits. What we learned so far? Electric Force Electric Field Ch 19: Electric potential difference (or Voltage) V is a scalar. SI unit:

Ohm’s Law The relationship between Voltage, Current and Resistance in any DC electrical circuit was firstly discovered by the German physicist Georg Ohm,

Series and Parallel.  a single resistance that can replace all the resistances in an electrical circuit while maintaining the same current when connected.

Ohm’s Law Resistance in Series Circuits

T By iTutor.comiTutor.com.

Lectures 7 to 10 The Electric Current and the resistance Electric current and Ohm’s law The Electromotive Force and Internal Resistance Electrical energy.

What we will do today Define the term ‘potential difference’. Look at the ratio V/I for a resistor. Define an equation relating resistance, voltage and.

WALT: about resistance and Ohm‘s law Success Criteria: You should know and understand the relationship between voltage, current and resistance.

Resistance and Ohm’s law. Resistance Some materials are better conductors than others. How do we quantify this difference? Electrical resistance R is.

E E 1205 Circuit Analysis Lecture 03 - Simple Resistive Circuits and Applications.

 When electric charges flow they experience opposition or resistance which reduces the amount of energy they have  Greater resistance -> greater amount.

SPH3U: Electricity Kirchhoff's Laws & Resistors. Circuits Review  Label the following as a Parallel Circuit or a Series Circuit. Label all the parts.

 As you should have observed from the lab experiment you performed yesterday, there is an inverse relationship between the current and the resistance.

HOW FAST IS A NANOSECOND?. ONE-BILLIONTH OF A SECOND!!!

Circuits and Ohms Law Through Investigation, I understand the relationship between current, voltage and resistance. I can apply this knowledge to solve.

MATCH THE UNITS 1. I = __________________ 1. I = __________________ 2. V = _________________ 2. V = _________________ 3. R = _________________ 3. R = _________________.

Electric Circuits Controlling the Current Imagine a bucket with a hose at the bottom. If the bucket is raised, water will flow out of the hose faster.

Chapter 27 Current And Resistance. Electric Current Electric current is the rate of flow of charge through some region of space The SI unit of current.

Electricity and its characteristics…  Conventional Flow theory states that flow of electrons is from positive to negative.(Accepted in the transportation.

Page 1 Ohm’s Law Engineering Science. Page 2 Introduction Ohm’s Law is named after Georg Simon Ohm who was a German Physicist and Mathematician. He discovered.

Ohm’s Law Aim: How does voltage and resistance affect current flow?

Ohm’s Law. Georg Simon Ohm born March 16, 1789, Erlangen, Bavaria [Germany]—died July 6, 1854, Munich German physicist who discovered the law, named after.

WARM UP Draw a picture of a SERIES Circuit. Show a battery, a switch, and a light bulb in your drawing. Draw a picture of a PARALLEL Circuit. Show a battery,

through a conducting metal

ELECTRICAL RESISTANCE

Electric Circuit Components are connected together with electrical wire to form a closed loop. Components are represented by symbols 1.

Current electricity.

Electric circuits e the significance of and the relationship between current, voltage and resistance.

Interim Stations Review

8.3 Resistance and Ohm’s Law

Warm Up #13 What is an electric current?.

3 3 Ohm’s Law UEENEEE104A DC PURPOSE:

Current Current Electricity - involves the flow of electrons in a conductor Such movement of these free electrons creates an electric current.

Review of Calculations

Circuit Theory Laws Circuit Theory Laws Digital Electronics TM

Current Current Electricity - involves the flow of electrons in a conductor Such movement of these free electrons creates an electric current.

ELECTRICITY & MAGNETISM Introduction (P )

One Thing at a Time Series Circuits.

Circuit Theory Laws Circuit Theory Laws Digital Electronics TM

Resistance in Circuits

Resistance in Series and Parallel

Ohm’s Law Page

Introduction to electricity part 2

Principles of Electricity: Electric Charge and Force

Series and Parallel Circuit

Chapters 18 & 19 What is the definition of electric potential?

Presentation transcript:

Electrical Resistance Let’s start on page 63 of this book  We will have eight (8) talking points today!

1. Definition, (words) The electrical resistance of an electrical element measures its opposition to the passage of an electrical current. Electrical resistance shares some conceptual parallels with the mechanical notion of friction. The SI unit of electrical resistance is the ohm (Ω).

2. Definition, (mathematically) The resistance of an object is defined as the ratio of voltage across it to current through it. Resistance = Voltage / Current

Georg Simon Ohm 1789-1854 German physicist 3. OHM’s LAW The relationship between resistance, voltage, and current is known as OHM’s LAW!

4. Circuits and Resistance In a SERIES circuit current is CONSTANT and voltage CHANGES.

4. Circuits and Resistance In a PARALLEL circuit current CHANGES and voltage is CONSTANT.

Look at page 68 (top) for series rules and page 69 (side) for parallel rules!

5. Classify electrical properties (page 70-71) Conductors – Insulators – Semi-Conductors –

R = r l / A = ___________ l = ___________ A = ___________ 6. Equation and Factors that Influence Electrical Resistance (page 66 –bottom) R = r l / A = ___________ l = ___________ A = ___________

7. Resistivity is inverse to Conductivity

8. Calculating TOTAL resistance, current, and voltage in series and parallel circuits.

Page 74: 11, 12, 13, 15-20 11. 12. 13. 15. 16. 17. 18. 19. 20.