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4. Consider the RC circuit shown at right. a) If S1 is held closed for 10 s before it is re-opened, determine the charge on the capacitor after this time. b) After S1 is released, supposed S2 is closed. Given that the voltage drop across the LED is 1.5 V, how long will it be before the LED turns off assuming it requires a minimum of 5mA to remain lit?

4. Consider the RC circuit shown at right. a) If S1 is held closed for 10 s before it is re-opened, determine the charge on the capacitor after this time. b) After S1 is released, supposed S2 is closed. Given that the voltage drop across the LED is 1.5 V, how long will it be before the LED turns off assuming it requires a minimum of 5mA to remain lit?

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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4. Consider the RC circuit shown at right. a) If S1 is held closed for 10 s before it is re-opened, determine the charge on the capacitor after this time. b) After S1 is released, supposed S2 is closed. Given that the voltage drop across the LED is 1.5 V, how long will it be before the LED turns off assuming it requires a minimum of 5mA to remain lit? 12V T S1 55.7μF 125 ΚΩ www S2 1 ΚΩ www
Transcribed Image Text:4. Consider the RC circuit shown at right. a) If S1 is held closed for 10 s before it is re-opened, determine the charge on the capacitor after this time. b) After S1 is released, supposed S2 is closed. Given that the voltage drop across the LED is 1.5 V, how long will it be before the LED turns off assuming it requires a minimum of 5mA to remain lit? 12V T S1 55.7μF 125 ΚΩ www S2 1 ΚΩ www
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