Alternating Voltage (AC Voltage): Voltage that changes direction periodically, usually in a sinusoidal pattern.
A sine wave represents AC voltage and current.
⚡ AI-Powered Electrician App
Study smarter with VoltageLab
Built for electricians, apprentices, and electrical engineers who want faster practice and better exam prep.
⭐️ Join thousands of electricians upgrading their skills
Voltage and current rise from 0 → maximum → 0 → negative maximum → 0, repeatedly.
