Macbook's "Internal Memory Card Reader" uses 896ma/900ma doing nothing, is this normal?
Current Required lists what is necessary to operate the device (the internal memory card reader) not what is being used.

This Apple Support article is about USB ports, but the information under Confirming power usage in System Profiler is directly applicable to your question. In this case the "port" over which power requirements are noted is where the internal card reader is connected to the motherboard, not the card reader itself.