Вопрос школьника по предмету Физика
Помогите решить задачи по физике
1.Какую работу совершает за 1 мин. электрический ток в лампе с сопротивлением 17.5 Ом, если напряжение в ней равно 3.5В
2.Какую работу совершает элек. ток за 5 мин.,проходя через двигатель стиральной машины мощностью 400Вт
Ответ учителя по предмету Физика
1) A=U^2*t/R=3,5^2*60/17,5=42 Дж
2) A=P*t=400*300=120000 Дж
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