What is the definition of "neutral wire"?
The wire that conducts the power back to the source and completes the circuit. The neutral wire is usually covered with white insulation.

## Electrical Systems Training

Class Information
 Tooling U classes are offered at the beginner, intermediate, and advanced levels. The typical class consists of 12 to 25 lessons and will take approximately one hour to complete.
 Class Name: Intro to Circuits 120 Description: This class describes the basic components of an electrical circuit and explains how they are represented in schematic drawings. Includes an Interactive Lab. Prerequisites: none Difficulty: Beginner Number of Lessons: 19 Language: English, Spanish

Below are all the competencies and job programs that contain the class Intro to Circuits 120. Job programs are our traditional class lists organized according to common job functions. Competencies are our latest job-specific curricula that help tie online learning to practical, hands-on tasks.

Click on any title to view its details.

Competencies Show All

Class Outline
• Objectives
• What Is a Circuit?
• Components of a Circuit
• Drawings and Abbreviations
• Source
• Path
• Resistance
• Control
• Protective Devices
• Grounding
• Chassis Ground
• Fuses
• Circuit Breakers
• Kirchhoff’s Laws
• Series Circuits
• Parallel Circuits
• Combination Circuits
• Summary

Class Objectives
• Understand the importance of a conductor.
• Identify the components in a basic circuit.
• Describe how schematic drawings use symbols to represent the parts of a circuit.
• Describe the purpose of the source in an electrical circuit.
• Describe the purpose of the path in an electrical circuit.
• Define resistance.
• Describe how a switch controls the flow of electrical current.
• Describe the purpose of the load in an electrical circuit.
• Identify the two basic types of circuit protective devices.
• Explain the purpose of a grounding conductor in an electrical circuit.
• Define a chassis ground.
• Explain how fuses operate.
• Explain how common circuit breakers work.
• Describe the main concept of Kirchhoff’s Laws.
• Describe a series circuit.
• Describe a parallel circuit.
• Describe a combination circuit.

Class Vocabulary

Vocabulary TermDefinition
Current that regularly reverses the direction of its flow.
Unit of measure for the strength of an electrical current.
The smallest particle of an element that still retains its characteristics.
Two metals with different expansion temperatures that are fused together. When heated or cooled, one strip pulls on the other and curls.
A grounded metal bar in a breaker box to which all neutral and grounding wires are connected.
The frame of a machine, such as a car or clothes washer.
A wire that runs from the motor to the machine's frame.
A controlled path for electricity. A circuit includes a source, path, load, and control.
A safety device that detects too much current in a circuit. A circuit breaker often contains a bimetallic strip that bends and trips a switch that opens a circuit.
A route for the flow of electricity that has elements of both series and parallel circuits.
A material or element that allows free movement of electrons and therefore allows easy flow of electricity. Most conductors are metals.
A connection between two conductors that allows electricity to flow.
A component in a circuit that controls the flow of electricity.
The flow of electricity. Current is measured in amps.
The system that serves as the source for household or building electricity. The electrical box is where the main electrical service comes in and is distributed throughout the building.
A form of energy created by the movement of electrons.
A negatively charged particle that orbits the nucleus of an atom. Electrons are involved in bonding and electrical conductivity.
A thin wire that becomes hot and bright when electricity passes through it. Used in most light bulbs.
A safety device that detects too much current in a circuit. A fuse often has a component that melts and opens the circuit.
Safely connected to a neutral body, like the earth, which can absorb a stray electrical charge.
Another name for the neutral wire in an electrical circuit.
A system that diverts stray current to a neutral source via the neutral (white) wire.
The extra wire in an electrical system that provides a low-resistance path to ground for stray current. The grounding conductor is usually bare copper or covered with green insulation.
An electrically charged, conductive wire that provides power to the load. The hot wire is usually covered with black insulation.
A material such as rubber or glass that does not readily conduct electricity.
Two laws that describe the flow of current in an electrical circuit. Put simply, they imply that what goes in must come out.
The component in a circuit that converts electricity into light, heat, or mechanical motion. Examples of loads are a light bulb, appliance, or machine.
The wire that conducts the power back to the source and completes the circuit. The neutral wire is usually covered with white insulation.
A component like a breaker or a fuse that protects circuits from too much current flow.
A route for the flow of electricity that has multiple paths.
A conductor that directs electricity in a circuit. The path is often copper wire.
A component like a fuse, breaker, or grounding circuit that prevents damage to an electrical system.
The opposition to current flow. Resistance is measured in ohms.
A graphical representation of an electrical system.
A route for the flow of electricity that has only one path.
The device that provides electrical power to a circuit. The source is the origin of electricity, such as a power plant.
The outermost orbit of electrons in an atom.
A measure of electrical pressure or potential. Voltage is measured in volts.
A drop in voltage along a conductor through which electricity is flowing. Occurs after electricity passes through a load.
A detailed plan for an electrical system.