Physics for IGCSE & O level - Magnets And Currents (Section 7 - No. 10)
In a transformer, the efficiency of the device is said to be 100% if:
Input power is greater than output power
Input power is equal to output power
Output power is greater than input power
There is no relationship between input and output power
Explicació
Ideal transformers have no energy losses so input power equals output power.