The charge transferred in 25 minutes by a current of 500 mA is 750 coulombs.
Amperes is defined as coulombs per second, so 500 mA is 0.5 coulombs per second. 25 minutes is 1500 seconds, so the charge is 750 coulombs.
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No. Capacitors need current to charge or discharge. In an open circuit, current is impossible, so they will stay at the last known charge, depending on the amount of leakage current.
Current = charge / time....so 0.67 c / 0.30 s = 2.23 A
We use the term net charge to define current due to unbalanced charges that flow.
Electric current is simply the flow of free electrons in a conductor. It is usually defined as the rate of charge flow, because the free electrons represent an electric charge.
Sure - an unconnected power supply of any kind - a battery is + at one end and - at the other.