In the circuit of Fig. 7.45, the lamp starts to conduct PRACTICAL whenever the lamp
Chapter 7, Problem 7.104(choose chapter or problem)
In the circuit of Fig. 7.45, the lamp starts to conduct PRACTICAL whenever the lamp voltage reaches 15 V. During PERSPECTIVE r O & the time when the lamp conducts, it can be modeled as a 10 kfl resistor. Once the lamp conducts, it will continue to conduct until the lamp voltage drops to 5 V. When the lamp is not conducting, it appears as an open circuit. Vs = 40 V; R - 800 kO; and C = 25 fiF. a) How many times per minute will the lamp turn on? b) The 800 kfl resistor is replaced with a variable resistor R. The resistance is adjusted until the lamp flashes 12 times per minute. What is the value of /??
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