fun fact: the uk tv license rules say im allowed to watch TV on my laptop when im at uni, but ONLY IF said laptop is not currently plugged into the wall
just an absolutely majestic rule lmao. so entertainingly arbitrary

@mynotaurus What if there's an isolation transformer or a UPS between the mobile device and the mains?

Edit: What if you convert water into hydrogen using mains power and move the tank to a hydrogen fuel cell that powers the mobile device? Is it still legally mains power?

Edit 2: What if you mined uranium using rechargeable tools recharged in your dorm room and operated a nuclear reactor there to power your tablet?