DC circuits

Question 1

define emf

Answer 1

emf is the potential produced by electro chemical cell or changing magnetic field. it is the force which causes the current flow,

Question 2

ohm’s law?

Answer 2

under constant temp and pressure conditions, the current flowing through the resistance is directly proportional to the potential difference applied across its end.

Question 3

define active and passive elements

Answer 3

the elements which supply electric power to the circuit are active elements. eg: all type of voltage and current sources.
elements which do not supply power to the circuit. they either consume electrical power or store electrical energy.
eg: R,L,C.

Question 4

define bilateral and unilateral elements.

Answer 4

elements which do not change their properties when the direction of applied voltage is changed are bilateral elements.
elements which change their properties when the direction of applied voltage is reversed are unilateral elements.

Question 5

define lumped and distributed elements.

Answer 5

the parameters which are visible and physically separable are referred as lumped parameters.
the parameters which are neither visible nor physically separable, such parameters are distributed over large network.

Question 6

define linear and non-linear elements.

Answer 6

the elements which show linear relsnship between the voltage and current are linear elements. they always follow ohm’s law.
the elements which do not show linear relsnship between the voltage and current are non-linear elements. they dont follow ohm’s law.

Question 7

define KCL.

Answer 7

the algebraic sum of all the current meeting the load or junction is 0.

Question 8

define KVL

Answer 8

the algebraic sum of all the voltage acting in a mesh or a loop is 0.