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анонимQ = 24 ккал = 100416 Дж.
t = 10 мин = 600 с.
S = 5 *10-7 м2.
U = 36 В.
ρ = 110 *10-8 Ом*м.
L - ?
Сопротивление R цилиндрического однородного проводника определяется формулой: R = ρ * L / S.
L = R * S / ρ.
Количество тепловой энергии Q, которая выделяется в проводнике, определяется законом Джоуля-Ленца: Q = U2 * t / R.
R = U2 * t / Q.
Длина нихромовой проволоки L будет определяться формулой: L = U2 * t * S / Q * ρ.
L = (36 В)2 * 600 с * 5 *10-7 м2 / 100416 Дж * 110 *10-8 Ом*м = 3,5 м.
Ответ: длина нихромовой проволоки электропечи составляет L = 3,5 м.
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