no cap(acitor) Flashcards

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1
Q

define the time constant of a capacitor-resistor discharge circuit

A

time taken for current to decrease to 1/e of its value

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2
Q

a capacitor is connected to a battery; explain, in terms of the movement of electrons, how its plates gain equal and opposite charge

A

electrons gained on one plate, making it negative; same number of electrons lost on other plate, making it positive

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3
Q

what is capacitance

A

charge per unit p.d.

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4
Q

a charged capacitor is connected to a resistor; explain, in terms of the movement of electrons, how p.d. across the capacitor changes

A

electrons move in clockwise direction (depends); so charges on plates decrease; p.d. decays exponentially

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5
Q

define the farad

A

coulombs per volt

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