In a 2-liter electric kettle with a capacity of 1 kW, water boils in 20 minutes, while in a kettle with a capacity of 3 kW

In a 2-liter electric kettle with a capacity of 1 kW, water boils in 20 minutes, while in a kettle with a capacity of 3 kW it would take 5 minutes. Why are low-power devices unprofitable?

Due to the increase in the heating time, losses by convection, heat conduction, and radiation increase.

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