PPL Aircraft General Knowledge: Centre-Zero Ammeter

[pjharb]

Hi all,

A quick question.. in a circuit where the battery is grounded, fully charged and is connected to a switch, centre-zero ammeter, busbar and alternator, does the centre-zero ammeter display 0 (needle in the middle) because the battery is fully charged, or will the needle be slightly on the positive side to indicate current flow from the alternator to the battery, even though the battery is fully charged and the busbar's load is supplied by the alternator.....

I'd go for the latter (0) but not 100% on this.

Thanks in advance,

PJ