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A 220V furnance uses a current of 4.5A to melt 5.5kg of lead in 12min. If the initial and melting temperatures of the lead are 16ᵒC and 327ᵒC respectively, its specific heat is 0.1278kJ/kgᵒC, and its latent heat is 22.72kJ/kg, calculate the furnance efficiency.

Home/ College/A 220V furnance uses a current of 4.5A to melt 5.5kg of lead in 12min. If the initial and melting temperatures of the lead are 16ᵒC and 327ᵒC respectively, its specific heat is 0.1278kJ/kgᵒC, and its latent heat is 22.72kJ/kg, calculate the furnance efficiency.