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5.4.4 LR Circuits

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5.4.4 LR Circuits

1. 1. L τ=   R
2. 2. 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 =2A
3. 3. 63% of the difference between the maximum voltage and the current voltage.
4. 4. Maximum Circuit Current = 10 amps
5. 5. Current = 63.2% = 6.32 amps Max Voltage = 10 amps 10 - 6.32 = 3.68 The difference is 3.68 amps 63.2% of 3.68 = 2.32 amps
6. 6. 6.32 + 2.32 = 8.64 amps