Chpt 20 - Potential Difference and Capacitance Flashcards
1
Q
What is Potential Difference?
A
(Between two points in an electric field) is the work done in bringing a charge of +1C from one point to the other.
—> unit = Volt (V)
(A.K.A Voltage)
2
Q
What is the Potential at a Point?
A
The potential difference between a point and the Earth.
3
Q
What is Capacitance?
A
The ratio of charge to voltage in a conductor.
4
Q
What are Common uses of a capacitor?
A
- To tune a radio station.
- In a camera flash gun.
5
Q
W=QV
A
Work done= Charge transferred x Voltage
6
Q
What is Farad?
A
1 Farad (F) = 1 Coulomb per volt (C/V)
7
Q
C =εA / d
A
Capacitance = (Permittivity of dielectric x Area of overlap) / distance
8
Q
W = (1 / 2) CV*2
A
Energy stored = (1 / 2) x Capacitance x Voltage
