Electric Potential and Potential Difference

What is electric potential difference? What is the SI unit of potential difference ? Name the device used to measure the potential difference. 

Mention the factor that maintains the flow of charge through a conductor.
(List: Resistance, Voltmeter, Ammeter, Current, potential difference)

Volt is a unit of:

Define electric potential and potential difference.

The rate of flow of charge from a body at a higher potential to a body at a lower potential is called _____

The potential difference between two points if $5 \mathrm{J}$ of work is done in moving a charge of $2 \mathrm{mC}$ from one point to another is $k\times {10}^3 \mathrm{volts}$. What is the value of $k$?

Find the electric potential (in volt) of a point if$2 \mathrm{J}$of work is done in bringing a charge of $0.2 \mathrm{C}$ from infinity to that point.

(Choose from:$10 /20 / 0.1 /0.2$ )

Connecting a battery in a circuit induces the flow of current because the battery provides the necessary _____ difference.