Core electrical code concepts, wiring basics, and safety rules tested on entry-level electrician licensing exams.
50 cards · basic cards · AI-written, checked twice. Edit anything.
- What is the National Electrical Code (NEC)?
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The set of electrical installation standards adopted in the United States, updated every three years.- What does wire gauge AWG indicate?
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The physical size of a wire; smaller numbers mean thicker wires with higher ampacity.- What is grounding in electrical systems?
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The intentional connection of electrical equipment to the earth or a conducting body that serves as the earth.- Define bonding in electrical wiring.
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The permanent joining of metallic parts to form a continuous path that allows fault current to flow safely.- What is the main difference between a circuit breaker and a fuse?
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A circuit breaker can be reset and reused; a fuse must be replaced after it melts.- What does GFCI stand for?
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Ground Fault Circuit Interrupter, a device that shuts off power when current leakage to ground is detected.- Where must GFCI protection be installed?
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In kitchens, bathrooms, garages, crawl spaces, wet locations, and within 6 feet of a sink.- What does AFCI stand for?
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Arc Fault Circuit Interrupter, a device that detects and cuts off power when an arc fault occurs.- When are AFCI breakers required?
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In bedrooms and other living areas for branch circuits that supply outlets; required by NEC for fire protection.- What is a service entrance?
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The point where utility power enters a building, including the meter base, main disconnect, and panel.- What are the two most common single-phase voltages in residential wiring?
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120 volts and 240 volts.- What is three-phase power?
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An electrical system with three conductors carrying alternating current, 120 degrees out of phase, commonly used in industrial applications.- What is the purpose of a transformer?
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To change voltage and current levels in an AC circuit while maintaining constant power.- What is the difference between a branch circuit and a feeder circuit?
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A branch circuit runs from an overcurrent device to outlets; a feeder runs from the service panel to a sub-panel or load center.- What is a junction box used for?
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To house electrical connections and splices, providing a means to access and inspect wire connections.
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