nA

nanoampere

Electric currentexact by definition

The nanoampere is one billionth of an ampere. Sleep-mode current in a low-power microcontroller, ionisation smoke detector current, and the polarisation current in a linear polarisation resistance corrosion probe all sit in this range. The factor of 1e-9 is exact, being an SI prefix.

1 nA 1.0000000e-09 A