When a switch is closed, completing an lr series circuit, the time needed for the current to reach one half its maximum value is _____ time constants?

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DraeDrae2753 DraeDrae2753

01-05-2018
Computers and Technology

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When a switch is closed, completing an lr series circuit, the time needed for the current to reach one half its maximum value is _____ time constants?

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lilaipo lilaipo · Answer 1 · 2018-05-20T08:52:46+02:00

lilaipo lilaipo

20-05-2018

The answer is 0.693 . When a switch is closed, completing an LR series circuit, the time needed for the current to reach one half its maximum value is 0.693

e^(-t/T) = 0.5
-t/T = ln(0.5) = -0.693

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