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Measure of opposition to electric current
- Resistance is the measure of opposition to electric current. A short circuit is an electric circuit offering little or no resistance to the flow of current.
www.allaboutcircuits.com › textbook › direct-currentResistance | Basic Concepts Of Electricity | Electronics Textbook
The three basic principles for this tutorial can be explained using electrons, or more specifically, the charge they create: Voltage is the difference in charge between two points. Current is the rate at which charge is flowing. Resistance is a material's tendency to resist the flow of charge (current).
- 6 min
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Resistance is the measure of opposition to electric current. A short circuit is an electric circuit offering little or no resistance to the flow of current. Short circuits are dangerous with high voltage power sources because the high currents encountered can cause large amounts of heat energy to be released.
Ohmic materials have a resistance R R that is independent of voltage V V and current I I. An object that has simple resistance is called a resistor, even if its resistance is small. The unit for resistance is an ohm and is given the symbol Ω Ω (upper case Greek omega).
Nov 7, 2016 · A tutorial on the basics of electrical resistance, resistors, and Ohm's law which describes the relationship between voltage, current and resistance. I also show you how to build a simple...
- 9 min
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Ohmic materials have a resistance \ (R\) that is independent of voltage \ (V\) and current \ (I\). An object that has simple resistance is called a resistor, even if its resistance is small. The unit for resistance is an ohm and is given the symbol \ (\Omega \) (upper case Greek omega).
Jun 27, 2020 · Resistance occurs when electrons aren’t able to move through a conductor freely. This is typically due to a lack of free valence electrons in many structures. This leads to an increase in collisions between electrons and ions in a material.
Resistance is a measure of how difficult it is for electrical current to flow through a material, and it is measured in ohms (Ω). The resistance of a material depends on its geometry (length, cross-sectional area, etc.) and its resistivity (ρ), which is a fundamental property of the material.
