ELE 1001 Basic Electrical Technology Lecture 01 Introduction

ELE 1001: Basic Electrical Technology Lecture 01 Introduction to Electrical Circuit Elements & Source Transformation Dept of Electrical & Electronics

Required: Scientific Calculator Casio- fx-991 ES Dept of Electrical & Electronics Casio- fx-991 MS

Optional My Mobile No. : 9663611063 My Email: satyakam. deo@manipal. edu Dept of Electrical & Electronics

We will learn here… Ø Classify electrical circuit elements v Active & Passive v Linear & Non linear v Unilateral & Bilateral v Lumped & Distributed Ø Ideal & Practical Active Elements Ø Source Transformation Dept of Electrical & Electronics

Electric Circuit Definition: An interconnection of simple electrical devices with at least one closed path in which current may flow Dept of Electrical & Electronics

Classification of Circuit Elements q Active & Passive Elements v Active Elements (Source): Voltage & Current Sources v Passive Elements (Sink): Resistor, Inductor & Capacitor q Linear & Non-linear Elements v Linear (Satisfies Superposition): Resistor, Inductor, Capacitor v Nonlinear: LDR (Light Dependent Resistor), Thermistor q Unilateral & Bilateral Elements v Unilateral (Current Flow in one direction): Diode, Transistor v Bilateral: Resistor, Inductor, Capacitor* q Lumped & Distributed Discuss only lumped linear bilateral circuit elements. Dept of Electrical & Electronics

Passive Elements q Energy Consuming Elements: v Resistor (R): RI 2 q Energy Storing Elements v Inductor (L): Stores Energy In Its Magnetic Field [0. 5 LI 2] v Capacitor (C): Stores Energy In Its Electrical Field [0. 5 CV 2] Dept of Electrical & Electronics

Types of Active Elements Ideal Voltage Source: Ø Maintains constant voltage irrespective of connected load. Ø Internal resistance Rs = 0 Dept of Electrical & Electronics

Types of Active Elements contd… Ideal Current Source: Ø Maintains constant current irrespective of the load connected. Ø Internal resistance Rs = ∞ Dept of Electrical & Electronics

Practical Sources V-I Characteristics of battery Dept of Electrical & Electronics

Practical Sources contd… Dept of Electrical & Electronics

Practical Source Transformation Conversion of Practical Voltage source to Current source & vice versa R +a +a Is + Vs -b Dept of Electrical & Electronics R -b

Example Convert a voltage source of 100 V having an internal resistance of 7. 5 Ω to its equivalent current source. Draw the circuit representation of both forms of sources. +a +a VS = 100 V + - RS = 7. 5 Ω IP = 13. 33 A -b Dept of Electrical & Electronics RP = 7. 5 Ω -b

Summary We started with v How a typical electric circuit looks like? Then looked into v Different types of circuit elements & their classifications v Ideal & practical sources Finally concluded with v How to transform practical current & voltage sources? Dept of Electrical & Electronics