What Is Resistance?

A General Description…

“Ohms” is another way to call this element. Initially, it is a hindrance to the movement of electrons in the material. While a potential difference across the conductor encourages the flow of electrons, resistance discourages it. The rate at which charge flows between two terminals is a combination of these two factors.

All materials resist current flow to some degree. They fall into one of two broad categories:

Conductors: Materials that offer very little resistance where electrons can move easily. Examples: silver, copper, gold, and aluminum.

Insulators: Materials that present high resistance and restrict the flow of electrons. Examples: Rubber, paper, glass, wood, and plastic.

Initially, these measures are taken to specify a component or a circuit. The elevated the ohms are, the lower the current flow. If it is too high, a possible cause can be damaged conductors because of burning or corrosion. Overheating is a definite issue of resistance. This is because all conductors give off some degree of heat. They reduce impedance, the greater the current flow. Possible causes: insulators damaged by moisture or overheating.

Keep in mind…

Many components, such as heating elements and resistors, have a fixed-resistance value. These values are often printed on the components’ nameplates or in manuals for reference. The measured value should be within the specified resistance range. Any significant change in the said component value usually indicates a problem. This element may sound negative, but electricity can provide advantages.

The ohms of a conductor, or circuit element, generally increase with increasing temperature. When cooled to extremely low temperatures, some conductors have zero resistance. Currents continue to flow in these substances, called superconductors, after the removal of the applied electromotive force.

Meanwhile, this can have good and bad effects. If we are trying to transmit electricity from one place to another through a conductor, resistance is undesirable. Why? This is because electrical energy can turn into heat.

Using Ohm’s Law

Accordingly, troubleshooting technicians often determine resistance by taking voltage and current measurements and applying Ohm’s Law:

E = I x R

That is volts = amps x ohms. R stands for resistance in this formula. On the other hand, you can also convert the formula to R = E/I (ohms = volts divided by amps). However, this works only when the resistance is unknown.

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