how to calculate the power output of a transformer?

To calculate the power output of a transformer, use the formula: Power (P) = Voltage (V) � Current (I). For the secondary side, measure the output voltage and current. Ensure to consider the transformer’s efficiency, which is typically between 90% to 98%. The actual power output can be calculated as P_output = Efficiency � (V_secondary � I_secondary). This gives you the effective power delivered to the load connected to the transformer.