In the case of only 380V power supply, two incandescent lamps marked with 220V, 100W and 220V, 25W are used in series. What is the actual power consumption of these two bulbs [set filament resistance and rated state the same]

According to r = u ^ 2 / P, the resistance of two incandescent lamps is R1 = 484 Ω, R2 = 400 Ω
From P = u ^ 2 / R, P = 380 ^ 2 / (484 + 400) = 163.35w

Use "220 V 40 W" electric soldering iron to weld the semiconductor radio circuit. The electric soldering iron can work normally for 4 hours. The calculation is as follows: 1. Resistance of the electric soldering iron; 2. Current through the electric soldering iron; 3. Heat generated by the electric soldering iron

R = u ^ 2 / P = 220 * 220 / 40 = 1210 ohm
Current = P / u = 40 / 220 = 0.182a
W=PT=40*4*3600=576000J

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