Power is the rate of energy transfer, measured in watts (W). For a resistive load at a stated voltage, power = voltage × current. For example, 3,000W ÷ 230V ≈ 13.0A.

For general AC equipment, real power also depends on power factor: watts alone do not always give current by simple division. Use the manufacturer’s current and supply ratings for real equipment. Nominal 230V is a calculation reference, not a guarantee that every socket is always at exactly that value.