# Essential Electric Circuits Components

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Presentation. This address plots the essentials of Electrical CircuitsFor most understudies a lot of this will be familiarthis address can be seen as an update session for this materialIf there are any points that you are uncertain of (or that are unfamiliar to you) you ought to get to grasps with this material before the following lecturethe taking after addresses will accept a fundamental comprehension of these topicsWe will re

### Presentation Transcript

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﻿Part 2 Basic Electric Circuits & Components Introduction SI Units and Common Prefixes Electrical Circuits Direct Currents and Alternating Currents Resistors, Capacitors and Inductors Ohm's and Kirchhoff's Laws Power Dissipation in Resistors in Series and Parallel Resistive Potential Dividers Sinusoidal Quantities Circuit Symbols

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2.1 Introduction This address plots the nuts and bolts of Electrical Circuits For most understudies quite a bit of this will be well known this address can be viewed as a correction session for this material If there are any themes that you are uncertain of (or that are different to you) you ought to get to holds with this material before the following address the accompanying addresses will accept a fundamental comprehension of these subjects We will come back to take a gander at a few of these points in more detail in later addresses

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2.2 SI Units

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2.3 Common Prefixes

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2.4 Electrical Circuits Electric charge a measure of electrical vitality can be sure or negative Electric current a stream of electrical charge, regularly a stream of electrons traditional current is the other way to a stream of electrons Current stream in a circuit a managed current needs a total circuit additionally requires a jolt to bring about the charge to stream

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Electromotive drive and potential distinction the boost that causes a current to stream is an e.m.f. this speaks to the vitality brought into the circuit by a battery or generator this outcomes in an electric potential at each point in the circuit between any two focuses in the circuit there may exist a potential contrast both e.m.f. what's more, potential distinction are measured in volts

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A basic circuit A water-based similarity

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Voltage reference focuses all possibilities inside a circuit must be measured regarding some other point we regularly measure voltages as for a zero volt reference called the ground or earth

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Representing voltages in circuit charts traditions differ the world over we typically utilize a bolt, which is taken to speak to the voltage on the head as for the tail marks speak to voltages concerning earth

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2.5 Direct Current and Alternating Current Currents in electrical circuits might be consistent or may shift with time When streams fluctuate with time they might be unidirectional or rotating When the momentum streaming in a transmitter dependably streams in a similar bearing this is immediate ebb and flow ( DC ) When the course of the ebb and flow intermittently changes this is substituting ebb and flow ( AC )

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2.6 Resistors, Capacitors and Inductors Resistors give resistance they restrict the stream of power measured in Ohms ( ) Capacitors give capacitance they store vitality in an electric field measured in Farads (F) Inductors give inductance they store vitality in an attractive field measured in Henry (H) We will take a gander at every part in later addresses

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2.7 Ohm's Law The ebb and flow streaming in a channel is straightforwardly corresponding to the connected voltage V and conversely relative to its resistance R V = IR I = V/R = V/I

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2.8 Kirchhoff's Current Law At any moment the logarithmic whole of the ebbs and flows streaming into any intersection in a circuit is zero For instance I 1 – I 2 – I 3 = 0 I 2 = I 1 – I 3 = 10 – 3 = 7 A

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2.8 Kirchhoff's Voltage Law At any moment the mathematical entirety of the voltages around any circle in a circuit is zero For instance E – V 1 – V 2 = 0 V 1 = E – V 2 = 12 – 7 = 5 V

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2.9 P = VI P = I 2 R P = V 2/R Power Dissipation in Resistors The momentary power dissemination P of a resistor is given by the result of the voltage crosswise over it and the ebb and flow going through it. Consolidating this outcome with Ohm's law gives:

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2.10 & 2.11 Resistors in Series and Parallel Series R = R 1 + R 2 + R 3 Parallel

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2.12 Resistive Potential Dividers General case

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Example

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Example

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2.13 Sinusoidal Quantities Length of time between comparing focuses in progressive cycles is the period T Number of cycles every second is the recurrence f = 1/T

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2.14 Circuit Symbols

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Key Points Understanding the following few addresses of this course depends on comprehension the different themes canvassed in this session An unmistakable comprehension of the ideas of voltage and current is basic Ohm's Law and Kirchhoff's Laws are utilized broadly in later addresses Experience demonstrates that understudies have most issues with potential dividers – a subject that is utilized broadly in the following few addresses You are encouraged to ensure you are content with this material now