It is known that the effective value of AC voltage is 220 V and the frequency is 50 Hz. When t = 0, the instantaneous value is 110 V, then the expression of the instantaneous value of the voltage is given

When t = 0, the instantaneous value is 110V, arcsin (110 / 220 √ 2) = arcsin (√ 2 / 4) ≈ 21 ° and the initial phase is: 21 ° or 180 ° - 21 ° = 159 ° U (T) = 220 √ 2Sin (2 π * 50 * t + 21 °) = 220 √ 2Sin (100 π T + 21 °) or u (T) = 22

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