I have a circuit problem. There is a 30 V power source conected in series with a switch and a ten ohm resistor. The circuit then spling to an inductor of 10 mH and a 20 ohm resistor. I am having difficulty finding the current across the 20 ohm resistor. I got the current immediately after the switch closes as 1 A. Then a long time after the switch closed the current across the 20 ohm resistor is 0 A. What is the current when the switch is reopened. The circuit is now an LR circuit L = 10mH and R = 20 ohms. by V=IR I thought that the current across the resistor would be 1.5 A. However, it is not. Is V of the inductor different than the power supply? If so, I con't find a rule governing that. Thanks for any help.(adsbygoogle = window.adsbygoogle || []).push({});

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: LR Circuit.

**Physics Forums | Science Articles, Homework Help, Discussion**