The diagram below shows a simple camera flash circuit. When you turn the flash unit on, switch S1 is closed and the capacitor fully charges through a battery with voltage V0= 9.2 V and a resistor R1= 76 Ω . When the shutter button of the camera is pressed, switch S1 opens, switch S2 closes for a time t2= 3×10−2 s , after which S2 opens and S1 closes for the capacitor to be charged for the next flash. The capacitor is fully charged when switch S2 closes. Your task is to find the values of the capacitance C and resistance R2 such that:
1. The capacitor reaches 92% of the total charge in time t1= 2.68 s from a completely discharged state.
2. The energy delivered to the flash resistor R2 is E = 5.6×10−2 J before switch S2 opens.
What is the value of capacitance C?
What voltage does the capacitor have at the time switch S2 opens?
What is the value of resistance R2 ?
