Question

A coil has an inductance of 1.5 H and a resistance of 0.6 ohm. If the...

A coil has an inductance of 1.5 H and a resistance of 0.6 ohm. If the coil is suddenly connected across a 12-V battery, find the time required for the current to rise to 0.63 of its final value. What will be the final current?

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Answer #1

For an LR circuit, current at any time t is given as

         is the time constant

For present case

                                

On solving it we get t = 2.5 s

also current I = 0.63I_0

and

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