What is Amperage?
Plain-English explanation from a licensed Utah HVAC, plumbing, and electrical contractor.
Amperage is the rate of electrical current flow, measured in amperes (amps) — it's the volume of electricity moving through a wire, and every circuit is sized by its amperage capacity.
Full Definition
An ampere (amp, A) measures electric current — the rate of electron flow past a point in a conductor. Wire size, breaker rating, and load capacity are all expressed in amps. Common residential ratings: 15A (lighting, receptacles), 20A (kitchen, bath, garage receptacles), 30A (dryer, water heater), 40–50A (electric range, EV charger), 60A (subpanel), 100A/150A/200A (whole-home service).
Understanding amperage helps you talk through panel upgrades and new circuits intelligently. Your home's main service amperage (100A, 150A, 200A) determines what major loads you can add — a 100A panel often can't support an EV charger plus heat pump plus electric stove without an upgrade.
Common Questions
What amp service do I need for my home?
Gas-heat homes can usually live with 100A or 150A. All-electric homes (heat pump + electric water heater + EV) typically need 200A. New construction in Utah is almost always 200A standard.
What does it mean when a breaker trips?
It means current exceeded the breaker's rating long enough to trigger the thermal/magnetic mechanism. Causes: too many devices on one circuit, a short circuit, a ground fault, or a failing breaker.
Related Terms
Main Electrical Panel
The main panel (or 'service panel,' 'load center,' 'breaker box') is the central electrical distribution point in your home — where utility power comes in, is metered, and is divided into the individual circuit breakers that protect each room and appliance.
EV Charger
A Level 2 EV charger is a 240-volt circuit and wall-mounted unit that adds 20–40 miles of range per hour of charging — about 5x faster than the 120V Level 1 cord that ships with most EVs.
Subpanel
A subpanel is a smaller electrical distribution panel fed from your main panel — used to extend service to a garage, basement, addition, or detached shop without rerouting every circuit back to the main.
Recent ELECTRICAL work in Utah
A few installs and service calls from the AYSP crew.
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