About This Chapter
ASVAB: Electric Circuits - Chapter Summary
The chapter's lessons have numerous helpful visuals dealing with electric circuits that reinforce the content included in text. This ASVAB test prep chapter has the following areas of emphasis:
- Ohm's law and using it with circuits
- Direct and alternating current
- Series circuits and parallel circuits
- Semiconductors and different voltage sources
- Electrical resistance and equivalent resistance
- Electrical schematic symbols and circuitry fundamentals
- Insulators and conductors
You'll be guided through each of these chapter areas by the fun and engaging video lessons. The video tags can be used to handily reexamine any video lesson parts as you prepare for the test.
Objectives of the ASVAB: Electric Circuits Chapter
The ASVAB is used to see if your knowledge satisfies criteria for military enlistment and also may be used for selecting a proper military job assignment. The practice quizzes in this chapter give you an idea of how some questions on the ASVAB Electronics Information (EI) subtest could look. The multiple-choice EI subtest makes up about 11% of the computer-based ASVAB and nearly 9% of the paper and pencil one.
1. What is Electric Current? - Definition, Unit & Types
Like a river current is the flow of water molecules, electrical current is the flow of charged particles. In this lesson, we're going to explore what electrical current is, what causes it, and that, unlike a water current, electrical current doesn't always flow in one direction.
2. Electrical Resistance: Definition, Unit & Variables
We'll take a shopping trip to the mall to learn how electrical resistance works and how it is affected by resistivity, conductor dimensions, and temperature. We'll also take a look at several common appliances that take advantage of resistance to function.
3. Insulators and Conductors: Examples, Definitions & Qualities
In this lesson, we'll explore the reasons that some materials conduct electrical energy with ease while others block it almost completely. We'll also talk about the property of conductivity and some everyday examples of insulators and conductors.
4. What Is a Semiconductor? - Devices, Properties & Fundamentals
Microchips used in computer systems use a very thin sheet of silicon dioxide with microscopic electronic circuitry. Silicon is a semiconductor material, which means the material can be altered to either conduct an electrical current or not.
5. Voltage Sources: Energy Conversion and Examples
We use them every day, but no one really gives them much thought. What are we talking about? Why, voltage sources, of course! Batteries and generators are two of the most common sources of voltage that power our daily lives. We'll look at them in detail to see how they work.
6. Electric Circuit Fundamentals: Components & Types
Electric circuits can be configured to power several loads, such as light bulbs, in series or in parallel. In this lesson, we'll look at both types of circuits and see how the voltage, current, and resistance are affected by installing additional loads.
7. Electrical Schematic Symbols
After completing this lesson, you will be able to explain why electrical schematic diagrams are important, and recognize some of the most important symbols used in those diagrams. A short quiz will follow.
8. Alternating Current: Definition, Advantages & Disadvantages
Alternating current (AC) is easy to generate and use, with numerous advantages over direct current. In this lesson, we'll define AC, discuss its advantages and disadvantages, and provide a quiz.
9. Ohm's Law: Definition & Relationship Between Voltage, Current & Resistance
Did you know that electrical current is affected by the voltage and resistance in a circuit? In this lesson, we'll use Ohm's law, which tells us how current, voltage, and resistance are related, as we work through several electric circuit examples.
10. Using Ohm's Law with Circuits
After completing this lesson, you will be able to explain what Ohm's Law is and when it can be used. You'll also find out how to use Ohm's Law to solve circuit problems. A short quiz will follow.
11. How to Find Equivalent Resistance
After completing this lesson, you will be able to explain equivalent resistance and use equations to find the equivalent resistance of a basic series or parallel circuit.
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