4) Capacitance Flashcards
(6 cards)
1
Q
Give two reasons why a capacitor is not a suitable source for powering a cordless telephone.
A
- capacitor would be impossibly large to fit in phone.
- capacitor would need recharging very frequently.
2
Q
Explain how the initial charge on the capacitor could be determined from a graph of current against time.
A
determine area under the graph.
3
Q
State the three factors upon which the capacitance of a parallel plate capacitor depends.
A
- area of overlap of the plates.
- separation of/distance between the plates.
- permittivity constant of free space.
4
Q
Explain what is meant by a capacitance of 1 farad (F).
A
1 coulomb of charge is stored for a p.d. of 1 V between
the plates.
5
Q
State what is meant by a capacitance of 370 µF
A
a capacitor that stores 370 µC of charge for every 1 volt of pd across its plates.
6
Q
Define the capacitance of a capacitor.
A
charge stored per unit potential difference.
