Question

What is KVL? Give an example of the application of KVL. In your example, please include details of your circuit and all the KVL equations.

Answer 1

Kirchhoff's Voltage Law (KVL) is a fundamental circuit law which states that the algebraic sum of voltages in a closed loop is "0"

for writing KVL equation first consider the current direction in the loop and then while writing the equations the terminal at which current entering the source is considered as the sign for that source i.e. if the current in the voltage source for the given closed loop is flowing from negative to positive terminal then the sign of the voltage source is negative while writing the KVL equation the voltage of that source is written with '-' sign before it . For the passive elements like resistor the terminal at which the current entering is considered as positive while writing the KVL equation

Consider a circuit with two resistors in series and connected in series with a voltage source

let the potential across the resistor R1 be V1 and the potential across the resistor R2 is V2 and the voltage source is V

consider the current direction from negative terminal to the positive terminal of the voltage source (clockwise direction) and write equation accordingly

What if the current is assumed to be in counter clock wise direction?

for that take a example with voltage source 5V and two resistors R1 and R2 with resistance 2 and 3 ohms respectively now solve the circuit using KVL (assume the current direction to be in counter clockwise direction)