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Let’s find the magnitude frequency response of this RL circuit to determine what type of filter it operates as. We’ll start by converting the circuit to the 𝑠 domain and evaluating its transfer function 𝐻(𝑠). To study the frequency response, we’ll replace 𝑠 by 𝑗𝜔 and find the magnitude frequency response |𝐻(𝑗𝜔)|. Looking at the graph, we see a low-pass filtering effect. An ideal low-pass filter looks like a brick wall — a cutoff frequency before which there is a flat gain of 1 and after