ELE 1001: Basic Electrical Technology Lecture 01 Introduction to Electrical Circuit Elements & Source Transformation Dept of Electrical & Electronics Required: Scientific Calculator Casio- fx-991ES Dept of Electrical & Electronics Casio- fx-991MS Optional My Mobile No.: 9663611063 My Email: satyakam.deo@manipal.edu Dept of Electrical & Electronics We will learn here… Classify electrical circuit elements Active & Passive Linear & Non linear Unilateral & Bilateral Lumped & Distributed Ideal & Practical Active Elements 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 Active & Passive Elements Active Elements (Source): Voltage & Current Sources Passive Elements (Sink): Resistor, Inductor & Capacitor Linear & Non-linear Elements Linear (Satisfies Superposition): Resistor, Inductor, Capacitor Nonlinear: LDR (Light Dependent Resistor), Thermistor Unilateral & Bilateral Elements Unilateral (Current Flow in one direction): Diode, Transistor Bilateral: Resistor, Inductor, Capacitor* Lumped & Distributed Discuss only lumped linear bilateral circuit elements. Dept of Electrical & Electronics Passive Elements Energy Consuming Elements: Resistor (R): RI2 Energy Storing Elements Inductor (L): Stores Energy In Its Magnetic Field [0.5LI2] Capacitor (C): Stores Energy In Its Electrical Field [0.5CV2] Dept of Electrical & Electronics Types of Active Elements Ideal Voltage Source: Maintains constant voltage irrespective of connected load. Internal resistance Rs = 0 Ideal Voltage Source (DC) Vs Dept of Electrical & Electronics +Vs Types of Active Elements Ideal Current Source: contd… Ideal Current Source (DC) Maintains constant current irrespective of the load connected. Internal resistance Rs = ∞ Dept of Electrical & Electronics Is Practical Sources Practical Voltage Source Vs +- Rs V-I Characteristics of battery Dept of Electrical & Electronics Practical Sources contd… Practical Current Source Is Rs Dept of Electrical & Electronics Practical Source Transformation Conversion of Practical Voltage source to Current source & vice versa R +a +a Is + Vs - R -b 𝑉𝑠 = 𝑅 × 𝐼𝑠 Dept of Electrical & Electronics -b 𝑉𝑠 𝐼𝑠 = 𝑅 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 RS = 7.5 Ω VS = 100 V + - IP = 13.33 A -b Dept of Electrical & Electronics RP = 7.5 Ω -b Summary We started with How a typical electric circuit looks like? Then looked into Different types of circuit elements & their classifications Ideal & practical sources Finally concluded with How to transform practical current & voltage sources? Dept of Electrical & Electronics