Charging new iPad from the wall outlet through a USB-C adapter

Apple's own HDMI and VGA Adapters, used to connect your iPad to a TV, incorporate an additional connection to which you can connect your iPad's Power Adapter.

This is is explicitly designed to facilitate charging of your iPad while connected to and using the TV or computer monitor.

If you have the Magic Keyboard, you can charge your iPad via the pass through port and use the usb c port on the iPad itself for the USB to HDMI Cable