A tungsten wire in a vacuum has length 5 centimeter and, Ask an Expert

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A tungsten wire in a vacuum has length 5 centimeter and radius 3 millimeter. A potential difference is applied across it.

(a) Find what is the resistance of the wire at 293K?

(b) Assume the wire reaches an equilibrium temperature such that it emits 80 Watt in the form of radiation. Ignoring absorption of any radiation from its environment, find the temperature of the wire? (Note: e=0.320 for tungsten.)

(d) Find what voltage drop is required across the wire?

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