The arc lamp burns at a voltage of U = 80 V and consumes power P = 800 W. How much will the temperature of the supply wires increase after a period of time τ = 1 min after turning on the lamp, if the wiring is made with copper wire, the cross-sectional area of which is S = 4 mm2? Half of the released heat is given to the environment. Copper resistivity p = 1.7 • 10-8 Ohm • m, copper density D = 8.9 • 103 kg/m3, specific heat c = 395 J/(kg • K).
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