# 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 | 13th 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 i_{1} is the current drawn from battery of EMF V_{1} and i_{2} is the current drawn from battery of EMF V_{2} .
( if current values are found as negative that means it is charging current ) .
In this case of circuit given above , we have three unknowns i_{1} , i_{2} and i_{3} . 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.

_{1}is the current drawn from battery of EMF V

_{1}and i

_{2}is the current drawn from battery of EMF V

_{2}.

_{1}, i

_{2}and i

_{3}. Hence we need three equations to solve .

### Answered by Thiyagarajan K | 13th Oct, 2021, 09:16: AM

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