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Unit 3. Voltage, Current, & Resistance


Recall that Unit 1 presented a table of many electrical quantities, along with their units and abbreviations. The three quantities that technicians measure most often are voltage, current, and resistance. Another fundamental quantity that you must understand (even though you won't have to measure it very often) is charge. In this unit you'll develop a better understanding of these four quantities. We'll also look in more detail at resistor color codes and at different types of resistors. Finally, we'll also look at a mathematical topic that is not discussed in the book: significant digits.

Unit 2 Review

Schematic Symbols

Components in Series
Components in Parallel

Atoms and Electrons
Conductors
Insulators
Semiconductors

Charge

Voltage (Electromotive Force)
Voltage Sources

Current
Relating Current to Charge and Time

Resistance
Conductance
Resistors
Resistor Codes
Variable Resistors
Potentiometers
Rheostats

Digital Multimeter
Multimeter Challenge Game

Significant Digits
How Many Digits Should You Write?
Rules for Rounding

Unit 3 Review

Congratulations! You've completed the e-Lesson for this unit.