Electrical conductivity is the ability of a material to conduct electric current. It is measured in siemens per meter (S/m). The measurement of electrical conductivity is done by applying a voltage across a sample of the material and measuring the resulting current. The ratio of the applied voltage to the measured current is the electrical conductivity of the material. Conductivity can also be measured indirectly by measuring the resistance of a material and using Ohm's law to calculate the conductivity.