Module 1—Introduction to Matter, Energy, and Direct Current

Chapter 3: Pages 3-111 through 3-120

Pages i - ix, 1-1 to 1-10, 1-11 to 1-20, 1-21 to 1-30, 1-41 to 1-50, 1-51 to 1-60, 1-61 to 1-65, 2-1 to 2-10, 2-11 to 2-20, 2-21 to 2-29, 3-1 to 3-10, 3-11 to 3-20, 3-21 to 3-30, 3-31 to 3-40, 3-41 to 3-50, 3-51 to 3-60, 3-61 to 3-70, 3-71 to 3-80, 3-81 to 3-90, 3-91 to 3-100, 3-101 to 110, 3-111 to 3-120, 3-121 to 3-126, Appendix I, II, III, IV, V, Index

Q59. Is it considered safe for a person to touch any energized low-voltage conductor with the bare hand?

Q60. What should you do if you become aware a possible malfunction in a piece electrical equipment?

Q61. Who should perform CPR?

With the completion this chapter you have gained a basic understanding dc circuits. The information you have learned will provide you with a firm foundation for continuing your study electricity. The following is a summary the important points in the chapter.

A

A

3-111

An

The

mathematically, or you can use the Ohm’s law figure to determine the mathematical relationship between R, E, and l.

3-112

The

3-113

The

A

3-114

. The same current flows through each part a series circuit.

. The total resistance a series circuit is equal to the sum the individual resistances.

. The total voltage across a series circuit is equal to the sum the individual voltage drops.

. The voltage drop across a resistor in a series circuit is proportional to the ohmic value the

resistor.

. The total power in a series circuit is equal to the sum the individual power used by each

circuit component.

3-115

A

3-116

An

A

3-117

3-118

A

. The same voltage exists across each branch a parallel circuit and is equal to the source

voltage.

. The current through a branch a parallel network is inversely proportional to the amount

resistance the branch.

. The total current a parallel circuit is equal to the sum the currents the individual

branches the circuit.

. The total resistance a parallel circuit is equal to the reciprocal the sum the reciprocals

the individual resistances the circuit.

. The total power consumed in a parallel circuit is equal to the sum the power consumptions

the individual resistances.

The SOLUTION A COMBINATION CIRCUIT is a matter applying the laws and rules for series and parallel circuits as applicable.

3-119

1. Trace the current paths in the circuit.

2. Label the junctions in the circuit.

3. Recognize points which are at the same potential.

4. Visualize rearrangements, “stretching“ or “shrinking,“ connecting wires.

5. Redraw the circuit into simpler form (through stages if necessary).

3-120

Introduction to Matter, Energy, and Direct Current, Introduction to Alternating Current and Transformers, Introduction to Circuit Protection, Control, and Measurement, Introduction to Electrical Conductors, Wiring Techniques, and Schematic Reading, Introduction to Generators and Motors, Introduction to Electronic Emission, Tubes, and Power Supplies, Introduction to Solid-State Devices and Power Supplies, Introduction to Amplifiers, Introduction to Wave-Generation and Wave-Shaping Circuits, Introduction to Wave Propagation, Transmission Lines, and Antennas, Microwave Principles, Modulation Principles, Introduction to Number Systems and Logic Circuits, Introduction to Microelectronics, Principles of Synchros, Servos, and Gyros, Introduction to Test Equipment, Radio-Frequency Communications Principles, Radar Principles, The Technician's Handbook, Master Glossary, Test Methods and Practices, Introduction to Digital Computers, Magnetic Recording, Introduction to Fiber Optics