हीटिंग तत्व सामग्री का कौन सा गुण इसके संचालन के दौरान सटीक तापमान नियंत्रण को सक्षम बनाता है?

Which of the following is the primary reason electric heating is more efficient than non-electric heating methods?

A resistance furnace with a heating element of 50 Ω is used to melt 2 kg of a material. The material has a specific heat capacity of 500 J/(kg·K) and a latent heat of fusion of 250 kJ/kg. The furnace operates at 250 V DC. If the initial temperature is 25 °C, the melting point is 800 °C, and the furnace efficiency is 80%, how long will it take to melt the material completely?