4. In a flashing neon light circuit, at a time constant of 2.0 s is desired. If you have a 1.0 micro farad capacitor, what resistance should you use in the circuits?
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The time constant is given by the formula: \[ \tau = R \times C \] Show more…
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In a flashing neon sign display, a certain time constant is desired. (a) To increase this time constant, you should (1) increase the resistance, (2) decrease the resistance, (3) eliminate the resistor. Why? (b) If a 2.0 s time constant is to be tripled and you have a $1.0-\mu \mathrm{F}$ capacitor, by how much should the resistance change?
Shows the circuit of a flashing lamp, like those attached to barrels at highway construction sites. The fluorescent lamp $L$ (of negligible capacitance) is connected in parallel across the capacitor $C$ of an $R C$ circuit. There is a current through the lamp only when the potential difference across it reaches the breakdown voltage $V_{L}$; then the capacitor discharges completely through the lamp and the lamp flashes briefly. For a lamp with breakdown voltage $V_{\mathrm{L}}=75.0 \mathrm{~V}$, wired to a $95.0 \mathrm{~V}$ ideal battery and a $0.150 \mu \mathrm{F}$ capacitor, what resistance $R$ is needed for two flashes per second?
Figure shows the circuit of a flashing lamp, like those attached to barrels at highway construction sites. The fluorescent lamp $\mathrm{L}$ ( of negligible capacitance) is connected in parallel across the capacitor $C$ of an $R C$ circuit. There is a current through the lamp only when the potential difference across it reaches the breakdown voltage $V_{\mathrm{L}} ;$ then the capacitor discharges completely through the lamp and the lamp flashes briefly. For a lamp with breakdown voltage $V_{\mathrm{L}}=72.0 \mathrm{~V},$ wired to $\mathrm{a} 95.0 \mathrm{~V}$ ideal battery and a $0.150 \mu \mathrm{F}$ capacitor what resistance $R$ is needed for two flashes per second?
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