Which parameters affect the speed with which the capacitor discharges?
The rate at which a capacitor charges or discharges will depend on the resistance of the circuit. Resistance reduces the current which can flow through a circuit so the rate at which the charge flows will be reduced with a higher resistance.
Is RC time constant the same for charging and discharging?
The rate of charging or discharging is determined by the time constant of the circuit. The time constant of a series RC (resis-tor/capacitor) circuit is a time interval that equals the product of the resistance in ohms and the capacitance in farad and is symbolized by the greek letter tau (τ).
What is the voltage of a RC discharging circuit?
We saw in the previous RC charging circuit that the voltage across the capacitor, C is equal to 0.5Vc at 0.7T with the steady state fully discharged value being finally reached at 5T. For a RC discharging circuit, the voltage across the capacitor ( VC ) as a function of time during the discharge period is defined as:
How is the time constant of a discharge circuit calculated?
Thus the time constant of the circuit is given as the time taken for the capacitor to discharge down to within 63% of its fully charged value. So one time constant for an RC discharge circuit is given as the voltage across the plates representing 37% of its final value, with its final value being zero volts (fully discharged),
What is the time constant for a RC charging circuit?
The time period after this 5T time period is commonly known as the Steady State Period. Then we can show in the following table the percentage voltage and current values for the capacitor in a RC charging circuit for a given time constant. Notice that the charging curve for a RC charging circuit is exponential and not linear.
Why is the RC discharging curve steeper at the beginning?
RC Discharging Circuit Curves. When the switch is first closed, the capacitor starts to discharge as shown. The rate of decay of the RC discharging curve is steeper at the beginning because the discharging rate is fastest at the start, but then tapers off exponentially as the capacitor looses charge at a slower rate.