Series RLC Circuit and Resonance

PhysicsElectricity & CircuitsAges 17–18

A series R, L, C circuit driven by an AC voltage: graphs of u and i show their phase difference, alongside a phasor diagram and a curve of current versus frequency. Adjust L, C, or the frequency until Z_L = Z_C, the current reaches its maximum, and u falls in phase with i — this is electrical resonance, the principle behind tuning a radio.