Default is there a usb otg cable that'll power the phone and allow usb connections?

i like to use my nexus 5/7 to connect to my computer at home through VNC but it draws up quite a bit of power. Is it possible to have a OTG cable that'll connect to the MicroUSB port of the phone and then two cables come out, one that has female MicroUSB port to charge the phone, and a second cable that's a female USB port so I can connect a USB mouse to?