Hi please consider the two circuits included in the image;
Concerning Circuit A:
1) How many joules are required to operate this circuit for one hour?
Concerning Circuit B  Let us assume the capacitor is fully charged to 3v:
2) How long will the circuit operate before the voltage on the capacitor drops below 2v? How many joules are consumed and how many remain in the capacitor? Let us assume the circuit cuts off below 2v.
3) As the capacitor discharges, what expression describes the current through the circuit?
4) As the capacitor discharges, how does the voltage across R2 respond?
5) As the capacitor discharges, how does the voltage across D2 respond?
I am looking for the equations to describe the above phenomenon over a simulation that just spits out the answer. Specifically I am interested in the different methods to calculate the energy available in the capacitor and the amount of work it can do before some threshold is reached. Alternatively I would like to predict the state of charge by measuring it's voltage / current either directly or elsewhere in the circuit via deduction.
Thanks! This is not homework
Concerning Circuit A:
1) How many joules are required to operate this circuit for one hour?
Concerning Circuit B  Let us assume the capacitor is fully charged to 3v:
2) How long will the circuit operate before the voltage on the capacitor drops below 2v? How many joules are consumed and how many remain in the capacitor? Let us assume the circuit cuts off below 2v.
3) As the capacitor discharges, what expression describes the current through the circuit?
4) As the capacitor discharges, how does the voltage across R2 respond?
5) As the capacitor discharges, how does the voltage across D2 respond?
I am looking for the equations to describe the above phenomenon over a simulation that just spits out the answer. Specifically I am interested in the different methods to calculate the energy available in the capacitor and the amount of work it can do before some threshold is reached. Alternatively I would like to predict the state of charge by measuring it's voltage / current either directly or elsewhere in the circuit via deduction.
Thanks! This is not homework
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