Where it is needed to add or subtract impedances, the cartesian form is more convenient; but when quantities are multiplied or divided, the calculation becomes simpler if the polar form is used. A circuit calculation, such as finding the total impedance of two impedances in parallel, may require conversion between forms several times during the calculation. Conversion between the forms follows the normal conversion rules of complex numbers.
Where it is needed to add or subtract impedances the cartesian form is more convenient; but when quantities are multiplied or divided the calculation becomes simpler if the polar form is used A circuit calculation such as finding the total impedance of two impedances in parallel may require conversion between forms several times during the calculation Conversion between the forms follows the normal conversion rules of complex numbers