Figure 27-64 shows the circuit of a flashing lamp, like those attached to barrel

Question

Figure 27-64 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 RC circuit. There is a current through the lamp only when the potential difference across it reaches the breakdown voltage VL; then the capacitor discharges completely through the lamp and the lamp flashes briefly. For a lamp with breakdown voltage VL = 70.7 V, wired to a 95.3 V ideal battery and a 0.166 mF capacitor, what resistance R is needed for 4 flashes per second?

Explanation / Answer

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