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Measuring Electrical Resistance

Resistance is the quotient of the Voltage (E) in a circuit divided by the Current (I). Electricity is the flow of electrons through matter, and referred to as the current. The force of that current is the applied voltage also referred to as Electromagnetic Force (EMF). The ratio of the Voltage divided by the Current equals the resistance of the material or device under test (DUT).

Resistance and resistivity are often used interchangeably however they have slightly different meanings. In general terms, resistance is the capacity of a circuit or material to oppose the flow of an electrical current and is referred to as Ohms (Ω). Resistivity is the measurement of Resistance.

A converter like Fabrico or a solar manufacturer, for example, can’t automatically assume that the supplier specifications sheet provides the accurate information necessary to meet the customer’s application. A typical measurement can start by measuring the surface or bulk resistivity of a known insulator at a number of random locations to confirm that the supplier’s sample is within the range specified in the datasheet and is in fact the correct material requested by the customer for a particular application.

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