Question

1. Define electric current and its SI unit.
2- How do you define electric potential at a point? What is its
3. Name any two factors on which resistance of a metallic wire depend
4. What is the function of a rheostat in an electric circuit
5. Name the metal whose resistivity is minimum.
6. What is a superconductor?​

Answer 1

Answer:

1.An electric current is the rate of flow of electric charge past a point or region.

The SI unit of electric current is the ampere,

2.an electric field may b defined as the amount of work done per unit positive test charge in moving it from infinity to that point against the electrostatic force due to the electric field.

its unit is volt= 1 joule/coulomb

3.The electrical resistance of a wire or circuit is a way of measuring the resistance to the flow of an electrical current. A good electrical conductor, such as a copper wire, will have a very low resistance.

5.Platinum is the lowest resistivity is minimum.

6.Superconductivity is the set of physical properties observed in certain materials, wherein electrical resistance vanishes and from which magnetic flux fields are expelled.

4.