A 420-mH coil has a resistance of 10 ohms. If a 12V supply is applied to it, how long will it take for the coil current to build up to 69% of its maximum value

Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter18: Resistive-inductive Parallel Circuits
Section: Chapter Questions
Problem 1PA: Incandescent lighting of 500 W is connected in parallel with an inductive load. A clamp-on ammeter...
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A 420-mH coil has a resistance of 10 ohms. If a 12V supply is applied to it, how long will it take for the coil current to build up to 69% of its maximum value?

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