An electric doesn’t always have a single resistor or other electrical component in it, nor is the connection pattern always uniform. There can be a parallel or series connection at times or sometimes both. There can be multiple types of components attached to each other in an circuit. This leads to a problem of calculating the current and voltages across each component.
- 1. Junction rule: At any junction, the sum of the currents entering the junction is equal to the sum of currents leaving the junction
eg In above circuit, Incoming current is I1, Outgoing Currents are I2 and I3.
AsAs per Kirchhoff's Junction law, I1 = I2 + I3
- 2. Loop rule: The algebraic sum of changes in potential around any closed loop involving resistors and cells in the loop is zero