14 - Glossary of Electrical Terms: Essential Definitions

Send us Fan MailProfessional home inspectors must communicate using precise electrical terminology. This glossary episode covers essential terms for the National Home Inspector Exam and professional practice.Key Term CategoriesSafety Devices:GFCI (protects people from shock)AFCI (protects structures from fire)Circuit breakers and fuses (overcurrent protection)Grounding/Bonding:Grounding (surge protection, connection to earth)Bonding (clearing ground faults, low-resistance return path)GEC (grounding electrode conductor)EGC (equipment grounding conductor—really bonding)Service Components:Service drop/lateralService entrance conductorsService equipmentService pointElectrical Measurements:Voltage (pressure)Current/Amperage (flow)Resistance (opposition to flow)Power (work performed)Formulas:Ohm's Law: I = E / RWatt's Law: P = E × IJoule's Law: Heat = I² × R × TimeStudy Tips for GlossaryCreate flashcards for each termGroup terms by category (safety, measurements, components)Practice using terms in context (inspection reports)Understand relationships between terms (GFCI vs AFCI, grounding vs bonding)Memorize formulas and their applicationsReview terms before examCommon Confusion PointsGFCI vs AFCI:GFCI: Protects people (shock)AFCI: Protects structures (fire)Completely different devicesGrounding vs Bonding:Grounding: Connection to earth, surge protectionBonding: Low-resistance return path, clears faultsEGC vs GEC:EGC: Equipment grounding conductor (really bonding wire in cables)GEC: Grounding electrode conductor (connects system to earth)Service Equipment vs Panelboard:Service equipment: Disconnects all powerPanelboard: Contains branch circuit OPDs (may contain service equipment)Professional CommunicationUse precise terminology in:Inspection reportsClient communicationsConversations with electriciansExam responsesProfessional presentationsAvoid:Slang termsBrand names (unless necessary)Vague language ("thingy," "doohickey")Incorrect technical termsKey TakeawaysPrecise terminology essential for professional practiceUnderstand differences between similar termsKnow formulas and measurementsMaster safety device terminologyDistinguish grounding from bondingUse correct terms in reports and communicationFinal Exam PreparationReview all 14 episodes systematically. Focus on:Required locations/spacingClearance requirementsProper installation standardsTypical defectsSafety principlesFormulas and calculationsSeries CompletionCongratulations on completing the National Home Inspector Electrical Training series! You now have comprehensive knowledge of electrical systems from service entrance to final outlet. Continue practicing, gain field experience, and maintain ongoing education.Intro This episode is brought to you by GetSync.pro This episode is hosted by Charlie Bellefontaine of Chicagoland Home InspectorsFor complete training with visual materials, practice exams, and certification support, visit nhiexamprep.com© 2025 National Home Inspector Exam Prep Podcast. All rights reserved.