Context: Capacitors are connected in parallel with the power circuits of most electronic devices and larger systems (such as factories) to shunt away and conceal current fluctuations from the primary power source to provide a "clean" power supply for signal or control circuits. Audio equipment, for example, uses several capacitors in this way, to shunt away power line hum before it gets into the signal circuitry. The capacitors act as a local reserve for the DC power source, and bypass AC currents from the power supply. This is used in car audio applications, when a stiffening capacitor compensates for the inductance and resistance of the leads to the lead-acid car battery.

Question: Why are capacitors connected in parallel with the power circuits of many devices and large systems?
Answer: to provide a "clean" power supply for signal or control circuits

Question: How do the capacitors connected in parallel act with currents from the power supply?
Answer: as a local reserve for the DC power source

Question: What is one value a stiffening capacitor accounts for when used in for car audio purposes?
Answer: the inductance

Question: What is another value a stiffening capacitor accounts for when used in for car audio purposes?
Answer: resistance

Question: What do parallel capacitors do to fluctuating current in order to deliver "clean" power for control circuits?
Answer: conceal current fluctuations

Question: Why are capacitors connected in parallel without the power circuits of many devices and large systems?
Answer: Unanswerable

Question:  How do the capacitors connected perpendicullarly act with currents from the power supply?
Answer: Unanswerable

Question: What is one value a stiffening capacitor accounts for when used in for a plane audio purposes?
Answer: Unanswerable

Question:  What is another value a stiffening capacitor accounts for when used in for boat audio purposes?
Answer: Unanswerable

Question: What do parallel capacitors do to fluctuating current in order to deliver "dirty" power for control circuits?
Answer: Unanswerable