It is forbidden to use electricity on Yom Tov just as is the law on Shabbos.[1]
May one raise the temperature of an electric oven or stove on Yom Tov?[2]
No, unless one knows for certain that doing so will not extinguish any current currents and will not ignite any new currents of heat. However, some Poskim[3] are stringent even in such a case.
May one use ovens freely on Yom Tov even if they are thermostat based without Shabbos mode?[4]
Yes.[5]
style="text-align: justify">May one ask a gentile on Yom Tov to turn on the electricity/light?[6]
It is permitted to ask a gentile to turn on a light on Yom Tov for the sake of a Mitzvah, or in a time of great need.[7] It is forbidden to do so if it does not involve a Mitzvah or great need.
style="text-align: justify">May one ask a child on Yom Tov to turn on the electricity?
Some Poskim[8] rule that in a time of need one may ask a child that has not reached the age of Chinuch, to turn on the electricity for the sake of Simchas Yom Tov.
style="text-align: justify">If one transgressed and turned on the electricity on Yom Tov may he benefit from it?
Yes, just as we rule regarding fire.
style="text-align: justify">May one set up an electric oven to turn on, on Yom Tov, using a timer?[9]
Yes. It is permitted to cook/bake in an electric oven that was turned on before Yom Tov or that was turned on using a timer.
[1] The reason: As it creates a new fire.
[2] Piskeiy Teshuvos 502:2; Nitei Gavriel 20:11
[3] Beir Moshe 8:139; Rav Yaakov Yosef says it adds a new current and is thus forbidden.
[4] SSH”K 1:30
[5] The reason: As even if one causes the fire to extinguish [by closing the oven door] or turn on [by opening the oven door] this is an indirect action, Grama, and by a Psik Reishei of Gram Kibuiy or Havara one may be lenient. [Rav SZ”A ibid footnote 80]
[6] Minchas Yitzchak 3:37; Or Letziyon 20:6; Yom Tov Kehilchaso 22:8
[7] The reason: As doing so is a Shevus Deshvus on Yom Tov, being electricity is forbidden due to igniting a flame, which is only Rabbinically forbidden on Yom Tov.
[8] Beir Moshe 8:166; Piskeiy Teshuvos 502:2
[9] Nitei Gavriel 9:16