Find the wattage of a 10 ohm lamp at 20 volts.

Data: R (active resistance of the lamp) = 10 Ohm; U (voltage on the taken lamp) = 20 V.

The power of the lamp taken will be equal to the ratio of the square of the effective voltage and its resistance: P = U ^ 2 / R.

Calculation: P = 20 ^ 2/10 = 40 W.

Answer: The power of the lamp taken is 40 watts.

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