Im trying to understand some aspects of capacitor operation and safety.
1. What is the proper method for discharging capacitors. Will a simple tap of a screwdriver across the terminals do the trick or do I need to involve a circuit with resistors to slow the discharge and reduce the current.
2. What type of energy / charge can be expected from a capacitor. Take for example a 400V, 390 uF cap. What type of current / power is available from the discharge of a cap this size.
3. If caps only pass AC and block DC, how and why are caps used on DC systems?