no cap(acitor) Flashcards
define the time constant of a capacitor-resistor discharge circuit
time taken for current to decrease to 1/e of its value
a capacitor is connected to a battery; explain, in terms of the movement of electrons, how its plates gain equal and opposite charge
electrons gained on one plate, making it negative; same number of electrons lost on other plate, making it positive
what is capacitance
charge per unit p.d.
a charged capacitor is connected to a resistor; explain, in terms of the movement of electrons, how p.d. across the capacitor changes
electrons move in clockwise direction (depends); so charges on plates decrease; p.d. decays exponentially
define the farad
coulombs per volt