5.4.4 lr circuits
Post on 30-Jun-2015
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τ = L
R
Solution(a) L τ = R 10 = 60 = 0.17 seconds(b)the time it will take to reach its final value is five time constants (5 τ) 5 x 0.17 = 0.85 seconds
(c)the approximate final magnitude of current after 0.85 seconds can be calculated using ohmʼs law:
V I = R 120 = 60 = 2 A
63% of the difference between the maximum voltage and the current
voltage.
Maximum Circuit Current = 10 amps
Current = 63.2% = 6.32 ampsMax Voltage = 10 amps
10 - 6.32 = 3.68
The difference is 3.68 amps
63.2% of 3.68 = 2.32 amps
6.32 + 2.32 = 8.64 amps
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