Introduction to what it's all about.
Using an Electric Blanket on Shabbos. Flushing a Toilet with an Electric Pump on Shabbos. Is One Allowed to Turn Off an Appliance When...
(Melting ice.) freezing dry foods; freezing ice pops; automatic ice makers; freezing liquids not to lose taste or not to get spoiled;
(Melting ice.) Other types of necessities (in conjunction with putting frozen liquids and warm areas): child, oneg Shabbos, etc.