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dddd12349999
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What is the equation switched capacitors
- Thread starter dddd12349999
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AI Thread Summary
The discussion centers on the equation relating charging current i(vdd) to a series of switched capacitors (c1 to c5) with sequential switch closures and a delay time (td). A critical issue is raised regarding the potential for infinite current when the second capacitor is switched, although this is noted to occur only momentarily. When the switch for C2 closes, the voltages across C1 and C2 equalize almost instantaneously, allowing both capacitors to continue charging. The conversation highlights the need for careful consideration of circuit behavior during the switching process. Understanding these dynamics is essential for effective circuit design involving switched capacitors.
- #2
Carl Pugh
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There is a problem with your circuit.
When the second capacitor is switched, there is an infinite current through the switch.
When the second capacitor is switched, there is an infinite current through the switch.
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dddd12349999
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can we think about it as a variable capacitor?
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SammyS
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dddd12349999 said:
That's only for an instant.Carl Pugh said:
When the switch for C2 is closed, the voltages across C1 & C2 become equal to each other virtually instantaneously. Then the pair continue to be charged for that point.
Neglect gravity other than that of water; neglect friction.
F1=ρgsh=1000*10*1*(1+4)=50000 N;
F1=ρgsh=1000*10*0.1*4=4000 N;
F3=50000-4000=46000 N?
Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system
$$M(t) = M_{C} + m(t)$$
$$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$
$$P_i = Mv + u \, dm$$
$$P_f = (M + dm)(v + dv)$$
$$\Delta P = M \, dv + (v - u) \, dm$$
$$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$
$$F = u \frac{dm}{dt} = \rho A u^2$$
from conservation of momentum , the cannon recoils with the same force which it applies.
$$\quad \frac{dm}{dt}...
TL;DR Summary: I came across this question from a Sri Lankan A-level textbook.
Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water.
I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
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