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Какое наименьшее число N одинаковых источников питания с ЭДС =1 В и внутренним сопротивлением r=1 Ом необходимо взять, чтобы на внешнем сопротивлении R=10 Ом выделилась максимальная мощность? Максимальная сила тока Imax=2 А.
Какое время требуется для нагревания 2 л воды (с=4,19*103 Дж/(кг*К)) от 20 оС до кипения в электрическом чайнике, если напряжение в сети 220 В, сопротивление спирали чайника 20 Ом, а КПД чайника 70 %?
Диэлектрик поместили в электрическое поле напряжённостью Ео=20 кВ/м. Чему равна поляризованность Р диэлектрика, если напряжённость среднего макроскопического поля в диэлектрике оказалась равной 4 кВ/м?
Здравствуйте, Артем! 1) При постоянном сопротивлении максимальная мощность достигается при максимальном токе. То есть надо, чтобы через сопротивление R=10 Ом шёл ток I=2 А. Напряжение должно быть U=R[$183$]I=20 В Итак, нам нужна батарея, создающая напряжение 20 В при силе тока 2 А. Запишем закон Ома для полной цепи [$8496$]бат-rбат[$183$]I=U Соединим источники параллельно в батареи по N штук и соединим M таких батарей последовательно. В этом случае имеем следующие характеристики: количество источников M[$183$]N ЭДС батареи [$8496$]бат=[$8496$][$183$]M Внутреннее сопротивление батареи rбат=r[$183$]M/N Подставляем: [$8496$][$183$]M-I[$183$]r[$183$]M/N=U M[$183$]([$8496$]-I[$183$]r/N)=U MN=UN/([$8496$]-I[$183$]r/N)=UN2/([$8496$][$183$]N-I[$183$]r) Выражаем производную и находим минимум d(MN)/dN=U(2N[$183$]([$8496$][$183$]N-I[$183$]r)-N2[$183$][$8496$])/([$8496$][$183$]N-I[$183$]r)2=0 2N·(ℰ·N-I·r)-N2·ℰ=0 2ℰ·N-2I·r-N·ℰ=0 ℰ·N-2I·r=0 N=2I·r/ℰ=4 В этом случае ток через каждый источник I1=I/N=0.5 A Напряжение на каждом источнике U1=ℰ-I1·r=0.5 В Отсюда выражаем N=U/U1=40 Итого требуется 4·40=160 источников
Рассмотрим третью задачу. Напряжённость Eср среднего макроскопического поля в диэлектрике равна разности напряжённости E0 поля при отсутствии диэлектрика и напряжённости обратного поля поляризации: Eср = E0 – 4πP, откуда находим P = (E0 – Eср)/(4π) = (20 – 4)/(4π) = 4/π ≈ 1,27 (кВ/м).
Здравствуйте, Артем! 2) Дано: v = 2 л = 2*10-3 м3 - объём воды; ρ = 103 кг/м3 - плотность воды; Θ1 = 20°C - начальная температура воды; Θ2 = 100°C - конечная температура воды; U = 220 В - напряжение сети; R = 20 Ом - сопротивление спирали чайника; η = 70% = 0.7 - КПД чайника. Найти время нагревания t = ? Количество энергии для нагревания: W = v*ρ*(Θ2 - Θ1)*с/η (1); мощность, выделяемая в спирали чайника: P = U2/R (2). Время нагревания t = W/P = v*ρ*(Θ2 - Θ1)*с*R/(η*U2) = 2*10-3*103*(100 - 20)*4.19*103*20/(0.7*2202) = 396 сек.
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