Kirchhoff’s Voltage Law Examples

Kirchhoff’s Voltage Law Examples:

Kirchhoff’s voltage law examples states that the algebraic sum of all branch voltages around any closed path in a circuit is always zero at all instants of time. When the current passes through a resistor, there is a loss of energy and, therefore, a voltage drop. In any element, the current always flows from higher potential to lower potential. Consider the circuit in Fig. 1.11. It is customary to take the direction of current I as indicated in the figure, i.e. it leaves the positive terminal of the vol-tage source and enters into the negative terminal.

Kirchhoff's voltage law examples

As the current passes through the circuit, the sum of the voltage drop around the loop is equal to the total voltage in that loop. Here the polarities are attributed to the resistors to indicate that the voltages at points a, c and e are more than the voltages at b. d and f respectively. as the current passes from a to f

Kirchhoff's voltage law examples

Consider the problem of finding out the current supplied by the source V in the circuit shown in Fig. 1.12.  Our first step is to assume the reference current direction and to indicate the polarities for different elements. (See Fig. 1.13).

Kirchhoff's voltage law examples

By using Ohm’s law, we find the voltage across each resistor as follows.

kirchhoff's voltage law examples

where VR1,VR2 and VR3 are the voltages across R1,R2 and R3, respectively. Finally, by applying Kirchhoff’s law, we can form the equationKirchhoff's voltage law examples

From the above equation the current delivered by the source is given by

kirchhoff's voltage law examples

MORE RELATED ARTICLE

Copyright © 2014 TO 2018 EEEGUIDE.COM All Rights Reserved Frontier Theme