Directions : (31-35) |
Kirchhoff's Rules |
In 1942, a German physicist Kirchhoff extended Ohm's law to complicated circuits and gave two laws, which enable us to determine current in any part of such a circuit. |
According to Kirchhoff's first rule, the algebraic sum of the current meeting at a junction in a closed electric circuit is zero. The current flowing in a conductor towards the junction is taken as positive and the current flowing away from the junction is taken as negative. |
According to Kirchhoff s second rule, in a closed loop the algebraic sum of the emfs and algebraic sum of the products of current and resistance in the various arms of the loop is zero. While traversing a loop, if negative pole of the cell is encountered first, then its e.m.f. is negative, otherwise positive.. |
A) law of conservation of energy
B) law of conservation of charge
C) law of conservation of momentum
D) Newton's third law of motion
Correct Answer: A
Solution :
Kirchhoffs Ist law is based on law of conservation of charge whereas Kirchhoffs IInd law is based on law of conservation of energy.You need to login to perform this action.
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