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.
b. Determine the peak voltage across the capacitor C₁ when the SCR 1 is off.
c. What is the peak voltage across R₁  during the charging phase if the battery voltage drops to 5 V?
d. What is the voltage across the lamp when the SCR turns on and the battery is fully charged at 6 V?
e. What is the current drawn from the battery if the lamp is dissipating 2 W of power?

Fig. 17.14

Transcribed Image Text:

Select to give desired charge D, R1 rate (value and wattage) SCR, C106YI D2 6.3 V ас input 50-60 Hz 100 μF 10 V 1 k2 6.3 V D3 R2 6-V 6-V 150 2 battery T lamp FIG. 17.14