Lots of devices have switched mode power supplies that will still output the same voltage. Last time I had a brownout the only thing that stopped working was th

Lots of devices have switched mode power supplies that will still output the same voltage. Last time I had a brownout the only thing that stopped working was the washing machine, and I thought that was broken. Paradoxically, it may be the lower voltages that are more dangerous, because it will result in a higher current draw from all the devices. Mains voltage has a nontrivial allowed range (in fact in Europe they increased it slightly so that devices would work across countries with slightly different original standards) but this is well out of spec.