Module 5: Capacitors and exponential decay

Question 1

Capacitance

Answer 1

The ratio of charge stored by a capacitor to the potential difference across it.

Question 2

Farad

Answer 2

1F = 1CV^-1

Question 3

Time constant of a circuit

Answer 3

The time taken for the current, charge stored or p.d. to fall to 1/e (about 37%) when a capacitor discharges through a resistor. It is also equal to the product of capacitance and resistance.