212CHAPTER 21 (b) ()( )32, maxmax0.11 A1.210 1.310 VRVIR=×Ω=×∆=( ), maxmax0.11 A1.11.1LLX∆= =×Ω=×(c) When the instantaneous current is a maximum ( )maxiI=, the instantaneous voltage across the resistor is 2max, ma0 VRRviRIRV∆===∆maxx1.31=×. The instantaneous voltage across an inductor is always 90° or a quarter cycle out of phase with the instantaneous current. Thus, when =, 0LvLvv. Kirchhoff’s loop rule always applies to the instantaneous voltages around a closed path. Thus, for this series circuit, sourcevR∆=∆+∆and at this instant when max=we have 2V×max01.3sourcevIR∆= +=10(d) When the instantaneous current iis zero, the instantaneous voltage across the resistor is 0RR. Again, the instantaneous voltage across an inductor is a
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