In theory ... on paper where you have ideal components ... a capacitor all by itself doesn't have
a time constant. It charges instantly. It only charges exponentially according to a time constant
when it's in series with a resistor, and the time constant is (RC). Keeping the same capacitor,
you change the time constant by changing the value of the resistor.
After 5 time constants, capacitor voltage/current will be about 99.3% of the input step change.
the capacitor and its associated resistor set the time constant.
Depending on the circuit, 63% of the available voltage.
The time constant is precisely the product R times C. The result of this product will be a time; it represents the time for the capacitor to discharge to about 37% (1/e, to be precise) of its initial voltage.
The same as the time constant of a 2.7 microfarad capacitor and a 33 ohm resistor connected in series.
After 5 time constants, capacitor voltage/current will be about 99.3% of the input step change.
the capacitor and its associated resistor set the time constant.
A: It is called discharging a capacitor. The charge will follow the rules of a time constant set up by the series resistor and the capacitor. 1 time constant 63% of the charge will be reached and continue at that rate.
Because the timing is set by the time constant of a resistor and a capacitor. With R in ohms and C in Farads, the time-constant is RC in seconds. If the capacitor leaks the timing will be wrong.
The time constant of a 4.7 µF capacitor in series with a 22 KΩ resistor is about 103 ms.
A larger time constant means that it takes longer for a system to reach steady state or for a process to change significantly in response to an input. In the context of a circuit, a larger time constant indicates slower charging or discharging of a capacitor.
Depending on the circuit, 63% of the available voltage.
The time constant is precisely the product R times C. The result of this product will be a time; it represents the time for the capacitor to discharge to about 37% (1/e, to be precise) of its initial voltage.
The same as the time constant of a 2.7 microfarad capacitor and a 33 ohm resistor connected in series.
Time constant in an RC filter is resistance times capacitance. With ideal components, if the resistance is zero, then the time constant is zero, not mattter what the capacitance is. In a practical circuit, there is always some resistance in the conductors and in the capacitor so, if the resistance is (close to) zero, the time constant will be (close to) zero.
About 5.5 volts.
When a current flows through a capacitor, the voltage across it increases or decreases depending on the rate of change of the current. If the current is constant, the voltage remains steady. If the current changes rapidly, the voltage across the capacitor changes quickly as well.