I have a friend who recently had a baby. The baby always sleeps in this automatic rocking thingy that runs on 4 "D" batteries(6 volts DC). Because they use this thing at least 10 hours a day or more, they are going through batteries like crazy!
I want to do him a favor and convert it so that it runs on regular AC power from a standard wall socket. I know that basically all I have to do is buy a '6 Volt AC-DC Adapter', cut the connector end off, strip some wire insulation from each end(+ and -), and wire it into where the "D" batteries connect, making sure I match the polarity etc.
BUT, my only question is with regards to amperage draw. My local Radio Shack sells three different '6 Volt AC-DC Adapters', one is rated at 1800 mA, one is 800 mA, and the other is 300 mA. Is there someway that I can measure how many milli-amps this automatic rocker thing draws? I have a Digital Multi-Meter and ASSUME that I can somehow use it to measure the amperage draw, but am not 100% sure??
Does anyone have any help or suggestions?