Next set of measurements are power transfer
efficiency tests. Maximum power drawn from the circuit
was 100 mA at 5 V. This results in 0.5 W on the
secondary while the primary was using 3.042 W. That
means this charger is around 16.44 % efficient. Much
higher efficiencies where achieved according to [2], but
with such low power consumption in the first place this
results are acceptable. With further tuning the efficiency
could be raised.