# How to explain Ohm’s law?

### How to explain Ohm’s law?

The ohm’s law indicates that the voltage across a resistor is proportional to the current flowing through it. This proportionality coefficient is the value of the resistance. The value of resistance R is a constant and therefore does not vary when the voltage or current is modified.

### How to explain the electric tension?

In a circuit electricthe flow electric is due to a circulation of “grains ofelectricity” called electrons. The tension is the level difference electric between the two terminals of a dipole. It is in a way the force which allows the “grains ofelectricity” (electrons) to move.

### When to use Ohm’s law?

The ohm’s law (U = R x I) is used to calculate the voltage across an ohmic conductor when the resistance and current are known. The ohm’s law also makes it possible to calculate the intensity of the current which traverses an ohmic conductor when its resistance and the voltage received are known.

### Why is voltage symbolized by U?

For the tension electric, the main symbol is “U“, with a relief symbol “V”. That’s how it is! Other choices could have been exercised. The letter “V” is, among other things, the symbol of the electric potential, while the tension is an electric potential difference.

### What is the Difference Between Electrical Resistance and Ohm’s Law?

The electrical resistance (R) is none other than the black rectangle, the current (I) is represented in red and the potential difference (V) is in green. For the assembly above, the formula of Ohm’s law is:

### What is the function of Ohm’s law?

Use of the law. According to its expression and the known quantities, Ohm’s law makes it possible to obtain different quantities: in the form U = R x I, it makes it possible to calculate the voltage when the resistance and the current are known; in the form I = U / R, it makes it possible to calculate the intensity when the tension and the resistance are known;

### What is Ohm’s Law?

This law is named after Georg Ohm who worked on the behavior of metallic conductors. It applies satisfactorily to thermostatically controlled metal conductors. When the temperature varies, the value of the resistance also varies so…

### What is Ohm’s Law?

From a local, i.e. mesoscopic point of view, Ohm’s (local) law is stated by saying that the mobility of charge carriers is independent of ‖ E → ‖ {displaystyle left|{vec {E}}right|} . Note that Ohm’s law must meet certain conditions: the homogeneity and isotropy of the medium;