no cap(acitor)

Question 1

define the time constant of a capacitor-resistor discharge circuit

Answer 1

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

Question 2

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

Answer 2

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

Question 3

what is capacitance

Answer 3

charge per unit p.d.

Question 4

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

Answer 4

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

Question 5

define the farad

Answer 5

coulombs per volt