Questions On Conduction, Displacement and Convection

1Q: What are the ways of the flow of electric current?
Ans: There are three ways - Conduction, Displacement and Convection.

2Q: What is conduction current?
Ans: In this method, the electrons transfer themselves from atom to atom in our direction, e.g. the flow of current across a metallic conductor.

3Q: What is displacement current?
Ans: When an insulator is connected to a battery, the electrons tends to move in the direction of positive terminal. This momentary displacement of electrons is referred as displacement current.

4Q: What is convection current?
Ans: The flow of electrons or ions from one electrode to another across vacuum or gas etc. is referred as convection current.

5Q: What is the unit and symbol of current?
Ans: The unit of current is ampere and it is denoted by letter I.

6Q: What is meant by one ampere?
Ans: If one coulomb(charge of 6.28 X 10^18 electrons) of charge is passed through a point of a circuit in one second, the magnitude of current is said to be one ampere.

7Q: What is meant by E.M.F.?
Ans: The force which sets up a flow of current in a circuit is called e.m.f. or 'electron motive force'.

8Q: What is the unit and symbol of e.m.f.?
Ans: Its unit is volt and symbol is E.

9Q: What is meant by P.D.?
Ans: When a current is passed across a resistor, it causes a potential difference to be developed across that resistor which is called P.D. or potential difference.

10Q: What is the unit and symbol of P.D.?
Ans: Its unit is volt and symbol is V.

11Q: What is meant by potential?
Ans: The electrical status of a body which decides the direction of flow of electric current is called its potential. The work done in moving a unit charge from infinity to that point is termed as potential.

12Q: What is the difference between E.M.F. and P.D.?
Ans: If the magnitude of current flow in a current flow in a current is zero then the P.D. will also be zero, whereas, e.m.f. will not be zero.

13Q: What is meant by resistance?
Ans: Resistance is defined as the natural property of every substance of producing hinderance to the flow of current across it.

14Q: What is meant by conductivity?
Ans: Conductivity is defined as the natural property of a conductor of producing relaxation to the flow of current across it.

15Q: What is meant by one volt?
Ans: If the work done in transferring a charge of one coulomb from one point to another in a circuit is one joule then the P.D. between the two points is said to be one volt.

16Q: What is the unit and symbol of resistance?
Ans: Its unit is ohm and symbol is omega.

17Q: What is meant by one ohm?
Ans: When a current of one ampere flowing through a conductor produces a p.d. of one volt then the resistance of that conductor is said to be one ohm.

18Q: What is the unit and symbol of conductivity?
Ans: Its unit is mho and symbol is omega reversed.

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