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Chapter 1

Basic DC Circuits

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Objectives

State the properties of the ideal voltage

source and ideal current source models

and show their schematic symbols.

State and apply Ohms law.

Discuss voltage and current

measurements and how they are made.

State and apply Kirchoffs voltage law.

State and apply Kirchoffs current law.

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Objectives

Determine equivalent resistance usingseries and parallel combinations.

Analyze a single-loop (series) circuit to

determine all the variables.Analyze a single node-pair (parallel) circuit

to determine all the variables.

State and apply the voltage divider rule.

State and apply the current divider rule.

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1-1 DC Circuit Variables

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Comparison of a DC Voltage and an AC

Voltage

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Conventional Current Flow in Opposite

Direction to Electron Flow

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Voltage Between Two Points in a Circuit

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Schematic Symbols for an Ideal Voltage

Source and a Battery

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Schematic Symbol for an Ideal Current

Source

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Schematic Symbol for a Resistance

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Illustration of a Short Circuit and an Open

Circuit

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1-2 A Very Simple DC Circuit

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Simple Circuit Used to Illustrate Ohms

Law

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Different Types of Ground

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Simple Circuit Redrawn with Ground

Symbols

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1-3 Measuring DC Circuit Variables

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A Voltmeter is Connected Between Two

Points in a Circuit Across Which the

Voltage is to be Measured

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An Ammeter is Connected Within the

Branch for Which Current is to be

Measured

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1-4 Power and Energy

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Reference Directions for Power Delivered

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Reference Directions for Power Absorbed

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1-5 Kirchoffs Laws

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A Loop Used to Illustrate Kirchoffs

Voltage Law

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Illustration of Kirchoffs Current Law at a

Node

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Circuit of Example 1-8

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Circuit of Example 1-9

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1-6 Equivalent Resistance

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Resistances in Series and the Equivalent

Single Resistance

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Resistances in Parallel and the

Equivalent Single Resistance

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Circuit of Example 1-10

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Reduction of the Circuit of Example 1-10

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1-7 Single-Loop or Series Circuit

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Representative Single-Loop (Series)

Circuit

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Circuit of Example 1-11

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Circuit of Example 1-12

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1-8 Single Node-Pair or Parallel Circuit

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Single Node-Pair (Parallel) Circuit

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Representative Parallel Circuit with

Current Sources

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Circuit of Example 1-13

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Circuit of Example 1-14

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1-9 Voltage and Current Divider Rules

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Circuit Used to Illustrate the Voltage

Divider Rule

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Circuit Used to Illustrate the Current

Divider Rule

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Circuit of Example 1-15

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Circuit of Example 1-16