Page 241 - Basic Electrical Engineering
P. 241
where,
The decay of current in the circuit has been shown in Fig. 2.162.
Figure 2.162 Decay in current in on R–L circuit
Like rise in current, the decay in current in an R–L circuit depends on the
time constant seconds.
Time constant for decaying current is obtained by putting t = τ the expression
for i as
As time is increased, the current goes on reducing. As for example the
magnitude of decaying current at time t = 5τ will be
