IOM 2016, Блиц — Задача 30

Olympiad of Metropolises, Moscow. Blitz Contest, September, 5 · 5 септември 2016 г.

Условие

The answer should be given in SI-units and rounded to the nearest integer, unless otherwise is stated. $g = 10$ m/s$^2$.

Seven 7.5 W Christmas tree lights are connected in series to each other and to a 105 V source. What is the resistance (in ohms) of a light bulb?

Решение

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Оригинал в Архива: blitz.pdf