L2_circuit_fundamentals_v2

L2_circuit_fundamentals_v2 - ESc102 Introduction to...

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ESc102: Introduction to Electronics Circuit Fundamentals: quick A Recap A R Harish Dept. of Electrical Engineering IIT Kanpur 26, 27 July 2010
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Concepts Charge, Current, Voltage, Power, and Energy Ohm’s Law KCL KVL 2
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Electrical Current The time rate of flow of electrical charge – The units are amperes (A), which are equivalent to coulombs per second ( C/s) André-Marie Ampère 1775-1836 Current has a magnitude and a direction 3
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Direct Current (DC) & Alternating Current (AC) When current is constant with time, we say that we have direct current, abbreviated as DC. On the other hand, a current that varies with time, reversing direction periodically, is called alternating current, abbreviated as AC ~ 4
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Voltage Voltage difference is a Source of current flow Units of Voltage: Volts (V) Alessandro Giuseppe Antonio Anastasio Volta 1745-1827 12 V V V + - - = 5
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Electrical Systems are made of Voltage sources, wires and a variety of electrical elements Resistor Capacitor Inductor Transformer Diode Transistor 6
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Connection of several circuit elements in closed paths by conductors Electrical Circuit Before we learn how to analyze and design circuits, we must become familiar with some basic circuit elements. 7
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Resistance ( ) ( ) v t R i t = × The constant, R, is called the resistance of the component and is measured in units of Ohm (Ω) Ohm’s law R Resistor Symbol: 8
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Conductance ( ) ( ) v t R i t = × ( ) ( ) ( ) v t i t G v t R = = × G = 1/R is called conductance and its unit is Siemens (S) Ernst Werner von Siemens 1816-1892 9
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v R i i G v = = 10
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