Current is the rate at which charge is flowing. Electric power is the rate at which electrical energy is transferred by an electric circuit. Given here the formula to calculate the current flow in the primary and secondary transformer. The transformer current formula is based on the ohm's law which states that the electric current is proportional to voltage and inversely proportional to resistance. The power is associated with ohm's law as it is a function of voltage multiplied by current.
Transformer Current Formula is defined as I = P / V. Where P = Power Rating and V = Voltage. Just by dividing the power rating with the voltage gives you the result of transformer current.