Wednesday, May 23, 2018

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Resistors in DC Circuits

Seventh Part of of DC Electricity for Industrial Instrumentation

Resistance is dissipative opposition to the flow of charge carriers. All conductors (except superconductors) possess some electrical resistance. The relationship between voltage, current, and resistance is known as Ohm’s Law:

V = IR

Conductance (G) is the reciprocal of resistance:

G = 1 / R

Resistors are devices expressly designed and manufactured to possess electrical resistance. They are constructed of a partially conductive material such as carbon or metal alloy. Resistors have power dissipation ratings as well as resistance ratings. Here are some schematic symbols for resistors:



The amount of power dissipated by a resistance may be calculated as a function of either voltage or current, and is known as Joule’s Law:

P = IV                                 P = V2 / R                                 P = I2R


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