24 hours. The discharge is equivalent to a voltage source, the discharge time is related to the resistance r and capacitance size c of the equivalent circuit at both ends of the capacitor, the larger the rc (that is, the larger the time), the slower the discharge, the discharge time depends on the quality of the capacitor, can be discharged before maintenance, generally the capacitance is larger, the size of the pinkie, it is easy to see, you can use the resistance discharge (soldering iron, incandescent lamp, incandescent lamp). Or make a special discharger, several hundred ohm resistance, plus lead), repair can be directly short-circuit discharge.
Capacitor power off six seconds time automatic discharge:
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For example, the current of the 8w24v load is 0.33a, and the resistance r is 72 Ohm, and the capacity required to maintain the current of 0.33a for 6 seconds through the capacitor will be large. This capacitor should be in parallel with the load, and the discharge current of the capacitor is required to maintain the load after the power is cut off. The voltage of this capacitor should be greater than 24v, and an electrolytic capacitor of 50v is optional.
After the capacitor is fully charged, even if it is not connected to the circuit, it will discharge through the air between the poles. Discharge speed and time are determined by the voltage between the poles, air temperature and humidity and other factors. Eventually the charge stored in the capacitor will be released. The capacitor will gradually discharge, but this degree is directly related to the quality of the capacitor, and the length of time is only.
When the capacitor is powered off, it dies immediately.