Concept #1: LR Circuits
Example #1: Unknown Resistance in an LR Circuit
Practice: An LR circuit with L = 0.1 H and R = 10 Ω are connected to a battery with the circuit initially broken. When the circuit is closed, how much time passes until the current reaches half of its maximum value?
Practice: Consider the LR circuit shown below. Initially, both switches are open. First, switch 1 is closed, and current is allowed to grow to its maximum value. Then, switch two is closed and switch 1 is open, and current is allowed to decay for 0.05 s. What is the maximum current in the circuit? What is the final current in the circuit if V = 10 V, L = 0.02 H, and R = 5 Ω?