What Is Alternating Current (AC)?
Alternating current (AC) is a type of electrical current in which the direction of flow periodically reverses. AC is the standard form of electricity supplied by the electrical grid and is used to power homes, businesses, and most EV charging infrastructure.
Why Alternating Current Matters in EV Infrastructure
Most electrical grids distribute power as AC, making it the most accessible source of electricity for EV charging. AC enables cost-effective and scalable charging installations at residential, workplace, and destination locations.
How Alternating Current Is Used in EV Charging
AC power is supplied from the grid.d
Power is delivered to the vehicle via a charging station.
The vehicle’s onboard charger converts AC into DC.
The battery stores energy in DC form
Typical AC Power Levels in EV Charging
3.7 kW – Residential single-phase supply
7.4 kW – Home and light commercial use
11 kW – Three-phase workplace charging
22 kW – Commercial and public charging
Where Alternating Current Is Commonly Used
Residential buildings
Commercial properties
Workplace and destination charging.g
Public electrical infrastructure
Key Benefits
Widely available power source
Lower infrastructure cost
Easy grid integration
Limitations to Consider
Requires onboard conversion to DC
Lower charging speed compared to DC charging
Related Glossary Terms
AC Charging
Direct Current (DC)
Onboard Charger
Electrical Grid
Alternating Current in EV Charging Systems
Alternating current forms the foundation of everyday EV charging, enabling reliable and accessible charging across a wide range of locations.