RESISTIVE CIRCUITS
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RESISTIVE CIRCUITS. SINGLE NODE-PAIR CIRCUIT ANALYSIS. IN PRACTICE NODES MAY ASSUME STRANGE FORMS. THIS ELEMENT IS INACTVE (SHORT-CIRCUITED). LOW DISTORTION POWER AMPLIFIER. SINGLE NODE-PAIR CIRCUITS. THESE CIRCUITS ARE CHARACTERIZED BY ALL THE ELMENTS HAVING THE SAME VOLTAGE

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RESISTIVE CIRCUITS

  • SINGLE NODE-PAIR CIRCUIT ANALYSIS


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IN PRACTICE NODES MAY ASSUME STRANGE

FORMS

THIS ELEMENT IS INACTVE (SHORT-CIRCUITED)

LOW DISTORTION POWER AMPLIFIER

SINGLE NODE-PAIR CIRCUITS

THESE CIRCUITS ARE CHARACTERIZED BY ALL

THE ELMENTS HAVING THE SAME VOLTAGE

ACROSS THEM - THEY ARE IN PARALLEL


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LOW VOLTAGE POWER SUPPLY FOR CRT - PARTIAL VIEW

SAMPLE PHYSICAL NODES

COMPONENT SIDE

CONNECTION SIDE


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THE CURRENT DIVISION

APPLY KCL

USE OHM’S LAW TO REPLACE CURRENTS

DEFINE “PARALLEL RESISTANCE COMBINATION”

BASIC CURRENT DIVIDER

THE CURRENT i(t) ENTERS THE NODE AND

SPLITS - IT IS DIVIDED BETWEEN THE

CURRENTS i1(t) AND i2(t)


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WHEN IN DOUBT… REDRAW THE CIRCUIT TO

HIGHLIGHT ELECTRICAL CONNECTIONS!!

IS EASIER

TO SEE THE

DIVIDER


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POWER PER SPEAKER

LEARNING EXTENSION - CURRENT DIVIDER

CAR STEREO AND CIRCUIT MODEL

THERE IS MORE THAN ONE

OPTION TO COMPUTE I2


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APPLY KCL TO THIS NODE

DEFINE “PARALLEL RESISTANCE COMBINATION”

FIRST GENERALIZATION: MULTIPLE SOURCES


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APPLY KCL TO THIS NODE

Ohm’s Law at every resistor

General current divider

SECOND GENERALIZATION: MULTIPLE RESISTORS


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20k||5k

General current divider


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FIND THE CURRENT

NOTICE THE MINUS SIGN

COMBINE RESISTORS

COMBINE THE SOURCES

STRATEGY: CONVERT THE PROBLEM INTO A

BASIC CURRENT DIVIDER BY COMBINING

SOURCES AND RESISTORS.

THE NEXT SECTION EXPLORES IN MORE

DETAIL THE IDEA OF COMBINING RESISTORS


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I2

I1

9mA

I1

I1

I2

I2

DIFFERENT LOOKS FOR THE SAME

ELECTRIC CIRCUIT


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I1

I2

I1

REDRAWING A CIRCUIT

MAY, SOMETIMES, HELP TO

VISUALIZE BETTER THE

ELECTRICAL CONNECTIONS

I2


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Determine power

delivered by source

+

V

_