Capacitors

Question 1

Capacitance

Answer 1

Charge per unit p.d. across the plates.

Question 2

Farad

Answer 2

The capacitance of a capacitor which stores a charge of 1C when a voltage of 1V is across the plates.

Question 3

Capacitors in series

Answer 3

1/C_T = 1/C₁ + 1/C₂ +…

Question 4

Capacitors in parallel

Answer 4

C_T = C₁ + C₂ + …

Question 5

Time constant

Answer 5

=(capacitance of capacitor)x(resistance through which it is charging or discharging) The time taken for the current, charge and p.d. for a capacitor to fall to 1/e of its original value when discharging through a resistor.