Physics
Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to:

The heating effect of current alone
Both the heating effect of current and hysteresis loss
Intense sunlight at noon
Hysteresis loss alone

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Physics
It takes much longer to cook food in the hills than in the plains, because

due to low atmospheric pressure on the hills, the water boils at a temperature higher than 100oC and therefore water takes longer to boil
in the hills the atmospheric density is low and therefore a lot of heat is lost to the atmosphere
n the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100oC causing an increase in cooking time
in the hills the humidity is high and therefore a lot of heat is absorbed by the atmosphere leaving very little heat for cooking

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