Ohm conducted research on the quantitative laws that characterize the flow of current through the circuit. I used in my experiments a magnetic needle and a conductor with current. Passing current through the conductor, he determined the angle of rotation of the arrow, as well as the parameters of the conductor. Ohm’s law is the basis for calculating the parameters of electrical circuits.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.