Предмет: Физика, автор: alexsogat

Помогите решить. Напряжение на реостате, подключенном к аккумулятору, равен 6В, сила тока цепи 3А. Когда сопротивление реостата изменили, напряжение стало равным 0В, а сила тока 2А. Найти внутреннее сопротивление аккумулятора

Ответы

Автор ответа: MashaPutnaj
0
Дано U1=6В      I1=3 A      U2 - 8 В     I2=2 А

по закону Ома    I= E/(R+r)
E= I1*(R1+r)
E=I2*(R2+r)
U=I*R
r=(U1-U2)/(I2-I1)=2/1=2 Ом
  у вас не указано второе U2





Автор ответа: alexsogat
0
извини, там немного неверно написал, U2=8
Автор ответа: MashaPutnaj
0
ну тогда вычисли сам
Автор ответа: alexsogat
0
хорошо) спасибо за формулы
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