Gene Fuller weote:
"Conservation of charge is one of the most fundamental laws of nature."

Unequal currents into and out of a passive black box are very simple to
produce. Suppose the black box contains a simple transformer with a
ratio other than one to one? The power can be constant but the voltage
and current must be different on input and output. R-F is a-c, not d-c.

Best regards, Richard Harrison, KB5WZI