Basic Electrical Engineering and Design Principles

Vocabulary flashcards covering electrical materials, wiring methods, system components, distribution paths, and electrical design principles.

Copper

The material most commonly used for standard building wiring because it is a great conductor and resists corrosion.

Solid Conductor

A conductor construction consisting of a single, continuous piece of metal, making it more rigid and ideal for fixed building wiring where the wire will not move frequently.

Stranded Conductor

A conductor type composed of multiple small strands that is flexible and easier to bend compared to a solid conductor.

Insulator

A non-conductive material wrapped around an electrical wire to prevent electric shock and stop wires from causing short circuits.

Silicon

The material used in most semiconductors, including integrated circuits, transistors, and solar cells.

Installation Location

An important environmental consideration when selecting electrical wiring materials (such as dry, damp, indoor, or outdoor conditions).

Light-Emitting Diode (LED)

A basic semiconductor device that produces light when an electric current passes through it.

Fuse

A protective device containing an internal element that melts and opens the circuit to stop current when an unsafe amount flows through it.

Circuit Breaker

An automatic switching device that detects excessive current in a circuit and trips (opens) to stop the flow of electricity.

Surge Protective Device (SPD)

A device designed to protect sensitive equipment from sudden, short-duration increases in voltage.

Grounding

A protective measure in electrical systems that provides a safe, low-resistance path for fault current to flow into the earth.

Armored Cable

A type of cable specifically constructed with a protective outer metal layer to prevent physical damage.

Conduit Wiring

A wiring method in which electrical wires are installed inside protective tubes called conduits.

Concealed Wiring

A wiring installation method where wires are placed inside walls, ceilings, or floors for a neat appearance.

Cable Trays

Support structures used in commercial or industrial buildings to keep cables organized while allowing open air circulation for heat dissipation.

Electrical System

A system whose primary purpose is to generate, transmit, distribute, manage, and utilize electrical energy.

Conductor

A material selected for wiring that allows electric current to move easily from one point to another.

Switch

A control device that manually opens or closes an electrical circuit, distinct from a circuit breaker which automatically interrupts excessive current or faults.

Panelboard

An electrical distribution assembly that receives incoming electrical power and distributes it to several branch circuits.

Basic Electrical Distribution Path

The standard delivery sequence: Electrical Source $\rightarrow$ Transformer $\rightarrow$ Main Switchboard $\rightarrow$ Panel Board $\rightarrow$ Branch Circuits $\rightarrow$ Electrical Loads.

Transformer

A component installed in an electrical distribution system whose primary function is to change the voltage level of alternating current (AC).

Electrical Load

Equipment that consumes electrical energy to perform a specific function.

Parallel Circuit

A circuit configuration providing separate branch paths for electricity, allowing other devices to continue operating when one branch is disconnected.

Voltage

The electrical potential difference that provides the force driving electric current.

Current

The rate of flow of electric charge through a conductor.

Branch Circuit

The wiring system extending from the final overcurrent protective device to the outlets or loads being served.

Common Building Voltage Systems

Standard voltage configurations identified in building distribution: $120/240\,\text{V}$, $208/120\,\text{V}$, and $480/277\,\text{V}$.

Ampacity

The limit describing the maximum continuous current that a conductor can carry safely under specified operating conditions.

Connected Load

The original combined electrical demand of all equipment gathered together before any demand factors or reductions are applied.

Energy

The quantity tracking the total electrical power consumed over an operating period, determined by $\text{Energy} = \text{Power} \times \text{Time}$.

Kilowatt

A unit equal to one thousand watts, used to express power prior to multiplying by operating hours to calculate energy.

Demand Load

The calculated electrical load that results after demand factors (reductions) are applied to the total connected load.

Overcurrent Protection

A protective mechanism wherein an overcurrent device automatically interrupts an overloaded circuit before conductors become endangered.

Voltage Drop

The reduction in electrical potential between the sending and receiving ends of a conductor caused by resistance or impedance.

Load Classification

An electrical design consideration that evaluates whether an electrical load operates continuously or intermittently before sizing conductors and components.

Symbol Legend

A reference key on an electrical plan or drawing that must be checked to correctly interpret unfamiliar electrical symbols.

Circuit Number

An item in a panel schedule that identifies the specific physical position and location of a branch circuit.

Panel Schedule

A reference document consulted after tracing a home-run identifier on a floor plan to determine the circuit's load and protective rating.