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Resistivity. When a voltage is applied to a conductor, an electrical field is created, and charges in the conductor feel a force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. This dependence can be very complex.
- 20.3: Resistance and Resistivity
For a given shape, the resistance depends on the material of...
- 20.3: Resistance and Resistivity
Hace 4 días · Learn how to use the Ohm's law formula and voltage formula to calculate resistance, current and power in electrical circuits. Use the Ohm's law calculator to find any two values based on the power formula.
Learn the key terms, equations, and skills related to current, resistance, and resistivity, and how to find the current direction. See examples, diagrams, and tips on how to visualize and understand these concepts.
Learn how to calculate the electrical resistance of a circuit component or device using Ohm's law and the resistivity of the material. Explore the factors that affect the resistance, such as temperature, geometry and resistor combinations.
Learn how to calculate the resistivity and resistance of a material based on its electrical conductivity and geometry. Find the formula for resistivity and resistance, and see examples and applications.
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).
