voltage and current relationship for capacitor?

[vead]

Hello
I need help to understand some basic. Suppose Capacitor is connected across DC supply. How to find out increase or decrease voltage across capacitor at particular time
From the reading it is found that the voltage of capacitor change over the time. Voltage increase or decrease over the time. mathematically dv/dt rate of change of voltage over the time
. If the value of capacitance is know and current through the capacitor is known also the dv/dt is known
. How to find out increase or decrease voltage over the time?

 

[Alec_t]

Currrent I = dq/dt (rate of change of charge) and charge change dq = C*dV (where C is the capacitance and dV is the change in voltage on the capacitor). So if you know I and C you can calculate dV/dt.

 

[vead]

Currrent I = dq/dt (rate of change of charge) and charge change dq = C*dV (where C is the capacitance and dV is the change in voltage on the capacitor). So if you know I and C you can calculate dV/dt.

I understand that capacitor store energy in form of electric file. When capacitor is connected across supply. Voltage of capacitor increase or decrease over time.
Look at the formula

What is meaning of it(dt) Actually I don't understand in formula how voltage, current and time are related by integration

 

[(*steve*)]

The (capacitor) voltage will only change over time if the (power supply) voltage changes over time.

With a capacitor across a voltage source the capacitor voltage and the power supply voltage are the same thing.

 

[AnalogKid]

If the capacitor is connected across a DC power supply and the supply doesn't suck, then it's output voltage is not changing, so neither the voltage across the capacitor nor the current through it change. If you are talking about how a discharged capacitor voltage changes when it is connected to the supply, how the voltage increases with time, that is a different question. In that case, the voltage increases based on the value of the capacitor, the current available from the power supply, and the power supply's output impedance or equivalent series resistance (ESR). Once you have these numbers, the math is pretty simple.

ak