Just after the switch has been closed, why does I=0? As always, we'll start with the concepts. The following figure, Figure 1, is a schematic ofa RL circuit with a switch.VLRFigure 1: Schematic of a RL circuit."R" includes the resistance of the coil, wires, and resistors, if any. At time t= 0, theswitch is open and no current flows. After the switch is closed, the current eventually(typically, really in only fractions of a second) approaches its maximum value Imax. Acurrent versus time graph for this RL circuit looks something that shown below in Figure2:ImaxFigure 2: Time dependence of the current flowing through a RL circuit.It's wise to understand the basic shape of this graph.Q2. Just after the switch has been closed, why does I = 0?

Just after the switch has closed, voltage induced across the inductor. And from Lenz's law , voltage…

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Just after the switch has been closed, why does I=0?

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter15: Alternating-current Circuits

Section: Chapter Questions

Problem 47P: A transformer is used to down 110 V from a wall socket to 9.0 V for a ro. (a) If the primary winding...

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Question

Just after the switch has been closed, why does I=0?

As always, we'll start with the concepts. The following figure, Figure 1, is a schematic of
a RL circuit with a switch.
V
L
R
Figure 1: Schematic of a RL circuit.
"R" includes the resistance of the coil, wires, and resistors, if any. At time t= 0, the
switch is open and no current flows. After the switch is closed, the current eventually
(typically, really in only fractions of a second) approaches its maximum value Imax. A
current versus time graph for this RL circuit looks something that shown below in Figure
2:
Imax
Figure 2: Time dependence of the current flowing through a RL circuit.
It's wise to understand the basic shape of this graph.
Q2. Just after the switch has been closed, why does I = 0?

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