Among the ** strength ** (** R **) of the ** current ** (** I **) and the ** tension ** (** V **) there is a simple relationship:

**Resistance** (**R) x ****Current** (**I) = ****Volatage** (**V**)

**Current**(

**I) =**

**Volatage**(**V**)

**
**

Since knowing two of these magnitudes we can simply get the third one.

**I** = **V** / **R **or inversely ** R** = **V** / **I**

Also **electric power** (** P **) can be calculated as:

**P = V x I **** **or ** P = R x I x I **

or by concluding the expression:

**P = R x I **²

That is, the resistance is directly proportional to the power and square of the current.

**
**# Joule Effect

When an electric current circuit creates a resistance to current passage, it results in an increase in its temperature.

This property is exploited to create resistors used in various electrical equipment to heat up.

An example of these applications are ironing irons, ovens, heat fans, phoners, etc ..

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