Before you read this, I suggest you read posts 17.44, 18.20 and 18.21. The picture above shows an electric circuit containing a resistor of resistance R (post 17.44) and an inductor of inductance L (post 18.21). I have used standard symbols for a resistor and an inductor. There is a time-dependant potential difference, V, between… Continue reading 18.22 Inductance and impedance

Before you read this, I suggest you read post 17.44. In post 16.25, we saw that an electric current produces a magnetic field. So, a current that changes with time produces a changing magnetic field. This effect was observed experimentally by the British scientist Michael Faraday (1791-1867). He also observed the inverse effect – a… Continue reading 18.21 Inductors and inductance

Before you read this, I suggest you read posts 17.44 and 18.19. Let’s think about the current I in the circuit above, which contains a resistor, of resistance R (post 17.44) and a capacitor, of capacitance C (post 18.19). A potential difference, V, which depends on time t is applied between P and P’ (see… Continue reading 18.20 Capacitors and impedance