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A 1.0 mm diameter and 300 mm long nickel wire is submerged horizontal in water at atmospheric pressure. At burnout, the wire has a current of 195 A. Calculate the voltage at burnout. The relevant thermos-physical properties are p f (fluid) = 959.52 kg/m3 p g (vapor) = 0.597 kg/m3 h f g = 2257000 J/kg σ = 0.0533 N/m

A 1.0 mm diameter and 300 mm long nickel wire is submerged horizontal in water at atmospheric pressure. At burnout, the wire has a current of 195 A. Calculate the voltage at burnout. The relevant thermos-physical properties are p f (fluid) = 959.52 kg/m3 p g (vapor) = 0.597 kg/m3 h f g = 2257000 J/kg σ = 0.0533 N/m Correct Answer 7.15 V

(Q/A) MAX = 1480000 W/m2. Let E b be the voltage at burnout. Then electric energy input to wire is E b I = 195 E b W.

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