PHYS 112 Lecture 37: Part 4 (AC circuits)
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B field b moni inductance l monza l emf v loi at. V4 it transformers only work for ac inputs alternatingcurrentalternatingv basedonfaraday"slaw voltage ratio 2 to turn ratio current ii. 40 4 t is the same inductors store energy like acapacitorstoredin bfield whichrequires work. Rl circuits current varies w time exponentiallythroughchargingdischarging where etimeconstant are circuits containing resistors capacitors are circuitscontainingresistors inductors exponential jna decay t y. Works w aconly turn ratio is a tovoltage ratio but powerconservation to current ratio. Ircand rldischarging circuits releasestoredenergythrough a resistor time constant rc or hr in sec. W in a magnetic field develops a sinusoidal oscillating current. Yt hz 11sec w 2k f sec ayyypqpqgygqyygy. gg of cycles per second frequency. Theprojection of a phasor along the y axis is sin wtt 0 x axis would make it cos which is leading. How to determine which sine wave is lagging versus. I establish the projections along the y axis i establish the phase diagram.
