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Figure 21.55 shows how a bleeder resistor is used to
Chapter 21, Problem 71(choose chapter or problem)
Figure \(21.55\) shows how a bleeder resistor is used to discharge a capacitor after an electronic device is shut off, allowing a person to work on the electronics with less risk of shock.
(a) What is the time constant?
(b) How long will it take to reduce the voltage on the capacitor to \(0.250 \%\) \((5 \% \text { of } 5 \%)\) of its full value once discharge begins?
(c) If the capacitor is charged to a voltage \(V_{0}\) through a \(\text { 100- } \Omega\) resistance, calculate the time it takes to rise to \(0.865 \mathrm{~V}_{0}\) (This is about two time constants.)
Figure \(21.55\)
Equation Transcription:
Text Transcription:
21.55
0.250% (5% of 5%)
V_0
100-Omega
0.865V_0
Questions & Answers
QUESTION:
Figure \(21.55\) shows how a bleeder resistor is used to discharge a capacitor after an electronic device is shut off, allowing a person to work on the electronics with less risk of shock.
(a) What is the time constant?
(b) How long will it take to reduce the voltage on the capacitor to \(0.250 \%\) \((5 \% \text { of } 5 \%)\) of its full value once discharge begins?
(c) If the capacitor is charged to a voltage \(V_{0}\) through a \(\text { 100- } \Omega\) resistance, calculate the time it takes to rise to \(0.865 \mathrm{~V}_{0}\) (This is about two time constants.)
Figure \(21.55\)
Equation Transcription:
Text Transcription:
21.55
0.250% (5% of 5%)
V_0
100-Omega
0.865V_0
ANSWER: