Hey guys,

my question is actually no homework, but I thought it would fit in here best.
a) DC Voltage: charge can be calculated via Q = C * U - right? (U = voltage)
b) AC Voltage: should be the same except for U beeing not a constant value but time dependent?
C) How do you calculate the charge on a capacitor in a circuit as described below?

So a little background on the project I'm working on. My brother is going to Tanzania in a month and I want to send him with something that can be they can use to read/do other activities at night. So, I'm using a solar panel to charge up capacitor than then power LED's. I'm using capacitors because I want something that's going to last for a really long time.

I know that when two caps are connected in sereis to a 12 volt battery as shown below, the 12 volts are divided between the two caps in reverse.

and voltage will remain fixed value on each capacitor for a long time

When I connect a 100KΩ resistor in parallrl to the lower (10u) capacitor, I noticed that the voltage on this capacitor decreases, and at the same time the voltage on the upper

I have a large capacitor that I'd like to check, but it's above the 10,000uF my multimeter can do.

I think that there should be a formula that would take (a) time (b) voltage A (c) voltage B (d) resistance, and calculate capacity.

That is, say I charge the capacitor to 30V, put a 10000ohm resistor across the leads, and in say 30 seconds it reads 1V.

HI

I need an urgent help me to design a super capacitor tester. The details are as given below
Intro:-

This document describes the prototype functioning of capacitor board Tester.
Design

The Capacitor board tester is micro controller based testing equipment which can test the proper functioning of Equivalent a super capacitors of 9.5 F.

A capacitor stores charge and current is the measure of flow of charge, when a capacitor discharges (in a circuit or by connecting a LED across its terminals) the stored charge flows so is it possible to convert charge stored in a capacitor to amps ? Or in other words how much current can a charged capacitor supply?

Do capacitors have current rating? I believe I have seen a datasheet who shows a maximum current rating of the capacitor but I thought that the amount of current going in and going out of the capacitor just fasten its charging and discharging rate and the capacitor is alright with any value.

HI,

I want to know how to calculate the value of bypass capacitor?

Hi, am trying to calculate capacitor value for full wave bridge rectifier with reference to below formula

C = Laod Current × Capacitor discharge time ÷ acceptable ripple amplitude
I.e.
C = (I × T÷2) ÷ (ΔV)

Capacitor discharge time is approximated to T/2 for full wave bridge rectifier.
For, I = 2.2 A, ΔV = 2V and,
(T÷2) = 1 ÷ (2 × F) =1 ÷ (2 × 50Hz) = 10ms

Thus substituting t