Refer to the emergency-lighting system of Fig. 17.14a. Sketch the waveform of the full-wav...

Refer to the emergency-lighting system of Fig. 17.14

a. Sketch the waveform of the full-wave rectified signal across the bulb using a drop of 0.7 V during conduction of each diode.

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b. Determine the peak voltage across the capacitor C₁ when the SCR₁ is off.

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c. What is the peak voltage across R₁ during the charging phase if the battery voltage drops to 5 V?

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d. What is the voltage across the lamp when the SCR turns on and the battery is fully charged at 6 V?

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e. What is the current drawn from the battery if the lamp is dissipating 2 W of power?

FIG. 17.14 Single-source emergency-lighting system.