You can "feel" AC - not the power but the sounds that it creates inside devices. There is a resident "hum" from most mains AC devices, particularly energy bulbs

You can "feel" AC - not the power but the sounds that it creates inside devices. There is a resident "hum" from most mains AC devices, particularly energy bulbs, linear tranformers, CRTs, switch mode power supplies, heating, appliances etc. If you're all DC with LED lighting etc, there is no 50/60Hz hum any more. You genuinely don't notice it until it's not there any more.