Question

A circuit diagram of the automobile ignition circuit is shown in the figure. Consider the circuit characteristics that provide the energy to ignite the fuel-air mixture in the cylinder. First, the maximum voltage available at the spark plug, vsp, must be high enough to ignite the fuel. Second, the voltage across the capacitor must be limited to prevent arcing across the switch or distributor points. Third, the current in the primary winding of the autotransformer must cause sufficient energy to be stored in the system to ignite the fuel-air mixture in the cylinder. Remember that the energy stored in the circuit at the instant of switching is proportional to the primary current squared, that is, ?0=Li2(0). Assume the following values in the circuit of the figure: Vdc=12 V, R=3 ?, L=5 mH, C=0.25 ?F, ?=50.(Figure 1).

A circuit diagram of the automobile ignition circuit is shown in the figure. Consider the circuit characteristics that provide the energy to ignite the fuel-air mixture in the cylinder First, the maximum voltage available at the spark plug, Uap, must be high enough to ignite the fuel. Second, the voltage across the capacitor must be limited to prevent arcing across the switch or distributor points. Third, the current in the primary winding of the autotransformer must cause sfficient energy to be stored in the system to ignite the fuel- air mixture in the cylinder. Remember that the energy stored in the circuit at the instant of switching is proportional to the primary current squared, that is, wo = Li2 (0). Assume the following values in the circuit of the figure: Vic 12 V, R-32, L- 5 mH C = 0.25 ?F, ? = 50.(Figure 1) Part A Find the instant of time when the voltage across the capacitor is maximum. Express your answer with the ap propriate units. te max = Value Units Submit Previous Answers Request Ans incorrect. Try Again: 5 attempts remaining Part B Find the maximum value of vc Express your answer with the appropriate units. Figure < 1of1 Ue= 1 Value Units Submit dc XIncorrect; Try Again; 5 attempts remaining Return to Assignment Provide Feedback

Answer 1