Define electrostatic potential at a point.

When is the potential difference between two points said to be $1$ volt?

Two bulbs are marked $60\, W, 220\, V$ and $100\, W, 220\, V$. These are connected in parallel to a $220\, V$ mains. Which one out of the two will glow brighter?

$(a)$ Name an instrument that measures electric current in a circuit. Define the unit of electric current.
$(b)$ What do the following symbols mean in an electric circuit?
$(c)$ Draw a closed circuit diagram consisting of a $0.5\, m$ long nichrome wire $XY$,an ammeter,a voltmeter,four cells of $1.5\, V$ each,and a plug key.

Name the commercial unit of electrical energy. Convert it into joule. What is the other name of the commercial unit?

What can be the difference between the specific resistance for a thin and thick wire made of the same material?