Question

explain potential at a point and potential difference with the help of a diagram​

Answer 1

Answer:

(a) Potential difference between two points in an electric circuit is defined as the amount of work done in moving a unit charge from one.

(b) The potential difference between two points is 1volt means 1joule of work is done in moving 1coulomb of electric charge from one point to the other.

(c) Given : Work done =250J,

Charge moved =20C.

we know that ,

Potential difference = Work done / Charge moved

=250/20=12.5

(d) A voltmeter is a device which is used to measure the potential difference between two points in an electric circuit. Voltmeter is always connected in parallel across the two points where the potential difference is to be measured.

(e) Voltmeter has a high resistance so that it takes a negligible current from the circuit.