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# CBSE Class 12-science Answered

when one applies kitchhoff loop rule the algebric some of the potential drops across the the cell the resistore is zero why I right professional applications of this law
Asked by umeshts142 | 13 Oct, 2021, 08:14: AM
Expert Answer
Kirchoff's voltage law helps us to get current distribution in different parts of complex electrical circuits.
It also helps us to get effective resistance across voltage sources like battery and thereby to determine
the net current drawn from voltage sources.

For example let us consider the circuit given above . There are two voltage sources (batteries) and six resistors .
Let us consider voltages ( EMF values ) of voltage sources are known and  resistance values of resistors are known .
From this known values , by considering the current distribution in the circuit as shown in figure,
we apply Kirchoff's voltage law to get the current values passing through different  resistors .

From the known current values , we also get current drawn from voltage sources.
For example value of i1 is the current drawn from battery of EMF V1 and i2 is the current drawn from battery of EMF V2 .
( if current values are found as negative that means it is charging current ) .

In this case of circuit given above , we have three unknowns i1 , i2 and i3 . Hence we need three equations to solve .

By applying Kirchoff's voltage law to the loops ABEFA and BCDEB , we get two equations .
Third equation is obtained from Kirchoff's current law at node B .

By solving three equations we get current distribution , therby we determine currents drawn from voltage sources .
We also know current passing through any resitor or power dissipated by any resistor.
Answered by Thiyagarajan K | 13 Oct, 2021, 09:16: AM

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