AFCI
A special breaker that watches for dangerous sparks inside wiring that you cannot see. Sparking usually happens when cords are damaged, wires loosen, or nails/screws hit wires in walls. Regular breakers cannot detect this. AFCI breakers shut the power off before a spark becomes a fire.
AMPS
A measurement of how much electricity is flowing through a circuit at one time. Think of it like the “amount of water” moving through a pipe. Every wire and breaker is designed to handle only so many amps. Too many amps causes heat and trips breakers.
Backfed Breaker
A breaker that is connected so power flows into the panel through the breaker instead of out to a branch circuit. Backfed breakers are most commonly used for generators or solar systems and must be properly secured in the panel so they cannot be removed while energized.
Bonding
The act of connecting metal parts of a home so they are all electrically linked together. This prevents metal from building up different electrical charges. If a fault occurs, the electricity travels safely back to the panel instead of shocking someone. Bonding applies to water pipes, gas pipes, metal boxes, and equipment.
Branch Circuit
A wiring path that sends electricity from the breaker panel to a room or device. Each branch circuit has its own breaker designed for the outlets, lights, or appliances it powers. Modern code requires some rooms (kitchens, bathrooms, laundry) to have multiple dedicated branch circuits.
Breaker
A switch designed to shut off automatically if a circuit becomes unsafe. Breakers protect wires from overheating by stopping electricity when too much current flows. They prevent house fires and equipment damage.
Cable
A group of insulated wires wrapped in a protective outer jacket. Cable allows multiple conductors (hot, neutral, ground) to run together safely behind walls. Different sizes of cable are used depending on how much power the circuit needs.
Circuit
A complete loop that electricity travels through. Power leaves the panel through a hot wire, runs through lights or devices, and returns on the neutral wire. If any part is broken or interrupted, the circuit stops working.
Combo Breaker
A breaker that includes both AFCI and GFCI protection in one device. This means it watches for sparks (arcs) and for shock hazards (ground faults). These are becoming required in many rooms as code modernizes.
Conduit
Tubing that shields and guides electrical wires, typically in garages, concrete walls, or outdoors. Conduit protects wires from physical damage, pests, sunlight, and moisture. It also keeps wiring organized and accessible for future changes.
Continuity
A measurement that shows whether electricity can travel unbroken through a wire, switch, or device. If continuity is lost, power cannot flow. Electricians test continuity to locate broken wiring or failed components.
Dedicated Circuit
A circuit designed to power only one appliance. Large appliances like microwaves, refrigerators, and air conditioners require their own circuits so they do not overload shared wiring.
Disconnect
A manual switch that shuts off power to a specific device or entire service. Common disconnects are found near air conditioners, spas, well pumps, or outside near the meter. They allow a tech to safely work without live power.
EMT
Electrical Metallic Tubing, also called thin-wall conduit. Lightweight metal tubing used to protect wiring on surfaces like garage walls or commercial buildings. It bends easily and provides physical protection.
Feeder
Wiring that carries power from one electrical panel to another location. Feeders are larger wires than branch circuits because they supply multiple circuits downstream. Examples include power to a detached garage, shed, or subpanel.
Fixture
A permanently installed lighting device connected directly to building wiring. Fixtures are different from plug-in lamps because they are part of the home’s electrical system. They must be properly supported and wired to a junction box for safety.
Fuse
A safety device used before modern breakers. A fuse contains metal that melts and opens the circuit when too much current flows. Once a fuse melts, it must be replaced instead of being reset like a breaker. Many older homes still use them.
GFCI
A device that protects people from shock by turning off power if it senses electricity leaking to ground. Required near water: kitchens, bathrooms, garages, outside outlets.
Ground
A safety path that directs stray electricity safely into the earth. Grounding prevents metal surfaces and appliances from becoming energized if something fails. It also gives breakers a path to react and shut off power.
Ground Rod
A metal rod driven deep into the soil and connected to the house grounding system. It provides a physical connection to earth for fault current, lightning energy, and other abnormal electrical events. Most homes require one or two rods.
Hot
The energized conductor that carries electricity from the panel to devices. The hot wire is what delivers power and is the one most likely to shock someone if touched. It is normally colored black or red.
Incandescent
Traditional light bulb that makes light by heating a metal filament. They are inexpensive but waste energy and run very hot. They are being phased out in favor of LED lighting.
Junction Box
A protective enclosure where wires are spliced or connected. All wire connections must remain inside a junction box to contain sparks and protect wires. Boxes also provide access for future repairs.
LED
Lighting technology that uses a semiconductor to produce light using far less energy than older bulb types. LEDs stay cool, last many years, and are required in new energy codes.
Load
Anything using electricity on a circuit—lights, appliances, motors, chargers, you name it. Bigger loads require thicker wire and larger breakers to avoid overheating.
Load Calculation
A math process used to determine how much total electricity a home or building needs. Electricians perform load calculations to size service equipment, choose panel sizes, and make sure circuits are not overloaded.
Main Breaker
A large breaker that shuts off electricity to the entire home or panel. It protects all circuits coming in and is used before doing any major electrical repair.
Main Lug Panel
A breaker panel that has no main shutoff inside it. Instead, it receives power from another panel where the main breaker is located. Main lug panels are often used as subpanels in garages, additions, barns, or sheds.
Meter Main
A single outdoor unit that contains both the electric meter and the home’s main shutoff. Very common in Florida upgrades because it keeps all service equipment outside. It allows the entire home to be disconnected at once from the outside.
Multimeter
A handheld test tool that measures voltage, current, and continuity. Electricians use it to check if circuits are powered, if wires are broken, or if parts are failing. It is the most important field tool for diagnosing electrical problems.
Neutral
The conductor that returns electrical current back to the panel after it has flowed through lights or devices. Completes the circuit loop with the hot conductor. A loose neutral often causes flickering lights or half-dead outlets.
Outdoor Rated
Equipment designed to safely handle rain, sun, humidity, and temperature changes. Outlets, boxes, and fixtures must meet this rating to be used outside. Indoor equipment cannot legally or safely be installed outdoors.
Overload
When more electrical current is being used than a circuit or wire is designed to carry. Causes overheating and will trip breakers or blow fuses. Happens often when too many appliances run on one circuit.
Panel
The main box in a home where electricity is distributed and protected. Electricity enters the house from the utility and goes into the panel. Inside are breakers that send power to every room and appliance. The panel keeps wiring safe by shutting off circuits that are overloaded, damaged, or unsafe. Most homes have one main panel and sometimes extra subpanels in garages, additions, or shops.
Panelboard
The formal name for a breaker panel or load center. It houses breakers that distribute and protect electrical circuits. Panelboards mark where the home’s wiring begins for every branch circuit.
Pigtail
A short piece of wire used to connect multiple wires to a single device, screw, or grounding point. Allows multiple conductors to be tied in safely without stacking wires under one terminal. Very common in outlet and ground connections.
Receptacle
A wall outlet that accepts a plug and supplies electricity. Receptacles can be standard, GFCI, tamper-resistant, or weather-rated depending on the location. Outdated or worn receptacles can cause heat or arcing.
Romex
The common trade name for nonmetallic indoor electrical cable (NM cable). Contains hot, neutral, and ground conductors inside a flexible plastic jacket. Standard wiring inside most residential walls.
Safety Switch
A manual switch used to shut off power to equipment or a structure. Required for air conditioners, spas, hot tubs, and outbuildings. Allows safe servicing without live voltage.
Service Drop
The overhead wires that come from the utility pole to the home. Bring electricity from the transformer to the meter and panel. Homeowners are responsible for everything after the attachment point.
Service Entrance
All equipment where power first enters the building—meter, main breaker, wires, and grounding. Includes the conductors from the meter to the main panel. Code requirements are strict because this part carries the most power.
Service Lateral
The underground version of a service drop. Runs below ground from the utility transformer or service pedestal to the home. Common in new developments because it eliminates overhead wires.
Service Upgrade
Replacing older service equipment with higher capacity or safer components. Examples include upgrading panels, meter mains, grounding, and feeders. Often required for remodels, additions, EV chargers, or large appliances.
Short Circuit
An unwanted direct connection between conductors that allows electricity to take the fastest path instead of the correct one. Short circuits create extremely high current instantly, causing heat, sparks, and often smoke. Breakers trip immediately to stop the flow and prevent a fire.
Smart Breaker
A modern breaker that monitors and reports electrical usage and trip events digitally. Smart breakers connect to apps and can alert homeowners to issues like overloads, arcing, or repeated trips. Helpful for tracking appliance power use or diagnosing electrical problems remotely.
Surge Protector
A device that protects equipment by absorbing or diverting voltage spikes. Whole-home surge protectors guard against lightning, utility switching, and appliance surges entering the electrical system. They prevent sensitive electronics from being damaged.
Transfer Switch
A switching device that safely connects a generator to a home’s electrical system. It prevents generator power from feeding back into utility lines, which could electrocute workers or damage equipment. Required for permanent generator installations.
Transformer
A utility or equipment device that changes voltage levels. Power travels long distances at very high voltage, then a transformer reduces that voltage to safe household levels. Transformers also appear in doorbells, electronics, and lighting systems.
Voltage Drop
The reduction of voltage as electricity travels across long or undersized wires. When voltage drops too much, lights dim and motors strain because they are not getting the power they need. Electricians prevent voltage drop by increasing wire size or shortening distance.
Volts
A unit measuring electrical pressure or force. Most homes use 120 volts for outlets and 240 volts for large appliances like ovens and dryers. Higher voltage delivers more power over the same wire size.
Watts
A measurement of electrical power usage or output. Watts equal volts multiplied by amps, which shows how much electricity something consumes. Bigger wattage means more electricity and higher energy cost.
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