Physics for IGCSE & O level - Magnets And Currents (Section 5 - No. 13)
If energy is wasted, the power delivered by the output coil is:
More than the power supplied to the input coil.
Less than the power supplied to the input coil.
The same as the power supplied to the input coil.
Unrelated to the power supplied to the input coil.
Forklaring
If no energy is wasted, power in equals power out.