Macbook's "Internal Memory Card Reader" uses 896ma/900ma doing nothing, is this normal? One a new mid-2014 macbook pro:

Internal Memory Card Reader:

  Product ID:   0x8406
  Vendor ID:    0x05ac  (Apple Inc.)
  Version:  8.20
  Serial Number:    000000000820
  Speed:    Up to 5 Gb/sec
  Manufacturer: Apple
  Location ID:  0x15400000 / 21
  Current Available (mA):   900
  Current Required (mA):    896
  Built-In: Yes


This is what System Report reports, there is no card in the reader, 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.