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[edit]
The value between ±V or in scalar equals to 2V
The Average Value[edit]
The Average Value is denoted as V_{a} is defined as

 V_{a} = 0.6 V
The Root Mean Square Value[edit]
The Root Mean Square Value is denoted as V_{rms} is defined as

 V_{rms} = 0.707 V