Electric Lamp

Electric Lamp
When an electric lamp is connected to a line of 220 V, which shines with 40W of power. What will power dissipated?

When an electric lamp is connected to a line of 220 V, which shines with 40W of power. What force of will dissipate when connected to a line 110 V?

If the lamp R is constant: P = U ^ 2 / R When the voltage is divided by 2 the power is divided by 4. But the resistance of a lamp varies with the temperature of the filament. Goodbye

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