how to calculate power flow in transformer?

To calculate power flow in a transformer, you need to determine the primary and secondary voltages, currents, and the turns ratio. Use the formula: Power (P) = Voltage (V) � Current (I) for both sides. The power flow can be expressed as P_primary = V_primary � I_primary and P_secondary = V_secondary � I_secondary. Ensure to account for losses and efficiency, typically expressed as a percentage, to get accurate power flow values.