(Det går også an å måle med et ampere-meter.)
EDIT: Fant et eksempel på en slik krets
http://arduinos.ecrater.co.uk/p/1653844 ... down-to-5v
Standby current: 6mA
EDIT2: Fant datablad som viser at denne TAPP-pluggen's volt-konverter bruker 35mA uten noe koblet til:
http://www.pashnit.com/pics/products/3B ... PP_2_1.pdf
TAPP quiescent current (power consumption with no load) will drain a small motorcycle battery in as little as three to five days if connected directly to the battery. It is recommended that TAPP be connected to a switched power source to prevent battery drain when the vehicle is not running. A Posi-Tap™ tap connector supplied in the installation kit makes a robust connection to the vehicle electrical system quick and easy.