Determine the resistance of the incandescent lamp if it says 100W and 220V.
| March 13, 2021 | education
Initial data: P (power of the incandescent lamp) = 100 W, U (voltage for which the incandescent lamp is designed) = 220 V.
We calculate the resistance of the incandescent lamp from the following formula:
P = U ^ 2 / R and R = U ^ 2 / P.
Let’s perform the calculation:
R = 220 ^ 2/100 = 48400/100 = 484 ohms.
Answer: The resistance of the incandescent lamp is 484 ohms.
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