Electrical Engineering - Capacitors - Discussion

Please explain.

If a resistor is connected in series with the capacitor forming an RC circuit, the capacitor will charge up gradually through the resistor until the voltage across the capacitor reaches that of the supply voltage. The time called the transient response, required for this to occur is equivalent to about 5 time constants or 5T. This transient response time T, is measured in terms of T = R x C, in seconds, where R is the value of the resistor in ohms and C is the value of the capacitor in Farads. This then forms the basis of an RC charging circuit were 5T can also be thought of as "5 x RC".

@Thamin.

You'r explained but very confuse. Any way you are only person is tried to answer this question. Thank you.

(please explain me again once to short answer).

Why the transient response is about 5T only ? I didn't get.

@Thamin.

You are answer is right but, little confusion. Please explain how you gate 5T?

Why is it 5T constant only ?

I mean how did you figure that out ?

Time Constant (t) : A measure of time required for certain changes in voltages and currents in RC and RL circuits. Generally, when the elapsed time exceeds five time constants (5t) after switching has occurred, the currents and voltages have reached their final value, which is also called steady-state response.

Please explain in shortcut.

To reach 100% full charge we need to consider 5T.

Time constant and current relationship is :

1Ts 63.2% of max current.

2Ts 86.5% of max current.

3Ts 95% of max current.

4Ts 98.2% of max current.

5Ts 100% of max current.