Explain the calculation of electrical circuits.

Ohm’s law is used to calculate electrical circuits. This law allows you to solve problems of finding the unknown values of the chain sections. These sections have active resistance, current flowing through the resistance and voltage at the ends of the electrical circuit. The law is determined by the mathematical formula: I = U / R, where I is current, U is voltage, R is resistance. Another law applies to parcels. This is the first Kirchhoff’s law, which reads as follows: in one node, the sum of currents is equal to zero.