Practical Electronics/Alternating current

Alternating current or AC refers to current that has amplitude varies sinusoidally and can be expressed mathematically
 * Vac = V Sin(ωt + θ)

The highest voltage is V. One cycle of Sin wave has one highest positive value at θ = π/2 and one highest negative value at θ = -π/2
 * Vac = ±V at θ = ± π/2

The Peak to Peak Value
The value between ±V or in scalar equals to 2V

The Average Value
The Average Value is denoted as Va is defined as
 * Va = 0.6 V

The Root Mean Square Value
The Root Mean Square Value is denoted as Vrms is defined as
 * Vrms = 0.707 V