ohm's law (hukum Ohm)

Ohm’s Law

Electric curent that flows in a conductor wire is directly proportional to the potential difference between the ends of the conductor wire.

That’s statement is known as Ohm’s law. Mathematically, the relation between electric current, electric potential difference, and resistant can be formulated as follows:

Resistivity

Resistance in an electric circuit can be measured by using multimetters. It is a spesific property of any material. Where can be shown as:

Where:

R=resistence ()

=resistivity (m)

L=length (m)

A= area (m²)

Example 2.3

A wire of 2 meter long has resistence 20. The section area is 2.5 mm². What is the resistivity of wire?

Conductor, semiconductor, and isolator

Conductors a material that easily conducts an electric current. They are: iron, copper, aluminum, and steel.

Semiconductor is a material or substance the electric conductivity of which lies between conductor and isolator. They are: germanium, and silicon.

Insulators is a material that is difficult to conduct an electric current or is not easily conduct with an electric current. They are: glass, wood, plastic, and rubber.