Answer to Question #138560 in Electric Circuits for Potyner

Question

Define (a) electric intensity (b) difference of a potential. How are these quantities related?

Answer 1

The electric current force is the value $I$ , which characterizes the ordered movement of electric charges and which is numerically equal to the amount of charge $Δq$ flowing through a given surface $S$ (cross section of the conductor) per unit time: $I =\frac {Δq} {t}$ .

Electric voltage (potential difference) between points A and B of an electric circuit or electric field is a scalar physical value, the value of which is equal to the operation of an effective electric field (including third-party fields), performed when transferring a single test electric charge from point A to point B.

$U=-\Delta\phi=\frac{A}{q}$ .

The Ohm law is an empirical physical law that determines the connection of electric voltage with the current intensity flowing in the conductor and the resistance of the conductor. $R=\frac{U}{I}$