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)?
- The set of electrical installation standards adopted in the United States, updated every three years.
- What does wire gauge AWG indicate?
- The physical size of a wire; smaller numbers mean thicker wires with higher ampacity.
- What is grounding in electrical systems?
- The intentional connection of electrical equipment to the earth or a conducting body that serves as the earth.
- Define bonding in electrical wiring.
- 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?
- A circuit breaker can be reset and reused; a fuse must be replaced after it melts.
- What does GFCI stand for?
- Ground Fault Circuit Interrupter, a device that shuts off power when current leakage to ground is detected.
- Where must GFCI protection be installed?
- In kitchens, bathrooms, garages, crawl spaces, wet locations, and within 6 feet of a sink.
- What does AFCI stand for?
- Arc Fault Circuit Interrupter, a device that detects and cuts off power when an arc fault occurs.
- When are AFCI breakers required?
- In bedrooms and other living areas for branch circuits that supply outlets; required by NEC for fire protection.
- What is a service entrance?
- 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?
- 120 volts and 240 volts.
- What is three-phase power?
- 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?
- 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?
- 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?
- To house electrical connections and splices, providing a means to access and inspect wire connections.