Collection: Resistances

The endurance It is a measure of the opposition to the flow of current in an electrical circuit.

Resistance is measured in ohms, symbolized by the Greek letter omega (Ω). Ohms were named after Georg Simon Ohm (1784–1854), a German physicist who studied the relationship between voltage, current, and resistance. He is credited with formulating Ohm's law.

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

• Drivers: Materials that offer very little resistance, where electrons can move easily. Examples: silver, copper, gold, and aluminum.
• Insulators: Materials that exhibit high resistance and restrict the flow of electrons. Examples: rubber, paper, glass, wood, and plastic.