इलेक्ट्रिक आर्क हीटिंग में, आर्क मुख्य रूप से किसके द्वारा बना रहता है?

Which property of a heating element material enables precise temperature control during its operation?

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?

Which type of electric heating method induces eddy currents in the heating element by electromagnetic action, whereby heat is transferred to the body from the heating element?

Which of the following materials should be selected for the heating element if a furnace is to be used for heating up to a temperature around 1500°C?