Volt (V)
A unit of electrical pressure or potential difference. US residential power is typically 120V (standard outlets) or 240V (large appliances, EV chargers). Solar panels produce 30-50V each.
Why It Matters
Understanding voltage explains why EV chargers and heat pumps need 240V circuits, and why electricians check voltage when sizing solar inverters.
Related Terms
Amp (Ampere)
The base unit of electric current, measuring how many electrons flow through a conductor per second. Household circuits are typically rated at 15, 20, or 30 amps.
Watt (W)
A unit of power equal to one joule per second. Solar panels are rated in watts (W) or kilowatts (kW = 1,000W).
DC (Direct Current)
Electricity that flows in one direction. Solar panels produce DC power, which must be converted to AC for home use.