7. a) What is meant by electric current?
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b) Name and define its SI unit.
c) In a conductor electrons are flowing from B to A. What is the direction of conventional current?
d) Give justification for your answer.
e) Name the factors on which the resistance of a conducting wire depends.
Answers
a) The rate of flow of electric charge is called electric current.
b) when 1 colum of flow in one second. SI unit is Ampere . it denoted by A.
c) True, it is right statement.
d) In a conductor election is flow the o opposite of conventional current.
e) FACTORS AFFECTING THE RESISTANCE.
(1) Temperature (2) Area of cross section.(3) Natural of material.(4) length of conductor.
Answer:
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Explanation:
Electric Current is the rate of flow of charge, I = Q/t where I is current, Q is charge and t is time. It is a scalar quantity. i.e it has only magnitude no direction.
Ampere is SI unit of current.
1 ampere is defined as the current when 1 C of charge is passing through a conductor for 1 second.
The direction of current is from A to B.
It moves in the opposite direction to the flow of electrons, i.e current flows from positive terminal to negative terminal.