Potential Difference and Capacitance

Question 1

Potential Difference

Answer 1

The potential difference (V) between two points in an electric field is the work done in bringing a charge of
+1 C from one point to the other

Question 2

Unit of Potential Difference

Answer 2

The unit of potential difference is the joule per coulomb ( J / C ). This unit is also called the volt

Question 3

The Volt

Answer 3

The potential difference between two points is 1 volt if 1 joule of work is done when 1 coulomb is brought from one point to the other
1 Volt = 1 Joule per Coulomb

Question 4

Electric Current

Answer 4

An electric current is a flow of electric charge

Question 5

Potential at a Point

Answer 5

The potential difference between a point and the Earth is called the potential of that point

Question 6

Capacitance

Answer 6

The capacitance (C) of a conductor is the ratio of the charge on the conductor to its potential. C = Q / V

Question 7

Unit of Capacitance

Answer 7

The unit of capacitance is the farad (F)

Question 8

The Farad

Answer 8

A conductor has a capacitance of 1 farad if placing a charge of 1 C on it raises its potential by 1 volt.
1 Farad = 1 Coulomb per Volt