Question

Determine the current through the battery in the circuit shown in Fig. 93. (1) immediately after the key K is closed and (2) in a long time interval, assuming that the parameters of the circuit are known.

Answer 1

At the first moment after the connection of the key K, the capacitors are not charged, and hence the voltage between points A and B is zero (see Fig. 93). The current in the circuit at this instant can be determined from the condition

Under steady-state conditions, the current between points A and B will pass through the resistors R₁ and R₃. Therefore, the current passing through these conductors after a long time is