How is Electrical Resistance Measured?

Electrical resistance is a force or material that impedes or resists the free flow of electrical current. Since its discovery by George Ohm in the 19th century, electrical resistance has been measured in “ohms”. Electricity is basically a flow of electrons. In the case of electrical current, the atoms in the structure of a conductive material either allow or impede the flow of electrons. Poor conductivity means that the atoms are arranged so that they impede, or resist, the flow of electrons. The actual measurement of electrical resistance (R) is accomplished with the division of voltage (V) by the current flow through an object (I), which is expressed in Siemens. Thus R = V/I. The factor of resistance is expressed in amperes (amps).  more

Electrical resistance is a force or material that impedes or resists the free flow of electrical current. Since its discovery by George Ohm in the 19th century, electrical resistance has been measured in “ohms”. Electricity is basically a flow of electrons. In the case of electrical current, the atoms in the structure of a conductive material either allow or impede the flow of electrons. Poor conductivity means that the atoms are arranged so that they impede, or resist, the flow of electrons.  more