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a Capacitor behaves short circuit in ideal when t=0 (initially) it means that if physical properties of such capacitor was suitable then the current flowing through cap would be infinite, but because of ESR it is not possible for real caps and for such ESR value initial current will be Vcap/ESR which is a very high amount of Amps For high amount capacities, ...


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edit /correction. ... A step voltage cause a step current max Ic (t)=Vcc/ESR. (@ t=0) when contact is made from discharged cap to an ideal voltage source then .... Current decays at a slope by ~60% of initial surge max Ic at t=0 when t = ESR*C =\$\tau\$ So consider an expensive big cap with Vcc =12V, and ultra low ESR was 12 milliohm that in theory ...


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In theory when an empty capacitor is connected to a ideal voltage source, infinite current flows until capacitor is charged to the supplied voltage. Basically same thing when disconnecting a powered inductor, in theory the voltage goes to infinity. Many devices like computer power supplies, LED lamps and phone chargers have inrush current limiting because of ...


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The two capacitors complement each others’ strengths and weaknesses. Large electrolytic capacitors work better at lower frequency than they do at high. This is due to their internal resistance, referred to as Equivalent Series Resistance, or ESR. They also have relatively high series inductance, or ESL. Both of these limit the electrolytic capacitors’ ...


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Okay, I find this from quora: answer from Rafal Muszynski Capacitors are connected on input and output side to secure stable (oscillation-free) operation and improve step response (behavior during sudden changes of the load or input voltage). Most of the times the required capacity is in order of 1uF-100uF and such values can only be practicaly ...


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