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The resistivity is a characteristic of the material used to fabricate a wire or other electrical component, whereas the resistance is a characteristic of the wire or component. To calculate the resistance, consider a section of conducting wire with cross-sectional area A, length L, and resistivity .
Learn about the physics of resistance in a wire. Change its resistivity, length, and area to see how they affect the wire's resistance. The sizes of the symbols in the equation change along with the diagram of a wire.
The resistance formula is as follows: Resistance = voltage drop across a resistor/ current flowing through a resistor. R = \(\frac{V}{I}\) R = resistance (Ohms, Ω) V = voltage difference which is between the two ends of a resistor (Volts, V) I = the current which flows through a resistor (Amperes, A) Resistance Formula Derivation. The ...
Formula for Resistance. Resistance of a conductor can be calculated as: R = \frac {ρ L} {A} R = AρL. where ρ is the resistivity of the material (a property dependent upon its composition), L is the length of the material and A is the cross-sectional area.
Electrical resistance is the hindrance to the flow of charge through an electric circuit. The amount of resistance in a wire depends upon the material the wire is made of, the length of the wire, and the cross-sectional area of the wire.
Learn about the physics of resistance in a wire. Change its resistivity, length, and area to see how they affect the wire's resistance. The sizes of the symbols in the equation change along with the diagram of a wire.
The resistance is a measure of how difficult it is to pass current through a wire or component. Resistance depends on the resistivity. The resistivity is a characteristic of the material used to fabricate a wire or other electrical component, whereas the resistance is a characteristic of the wire or component.
Learn about the physics of resistance in a wire. Change its resistivity, length, and area to see how they affect the wire’s resistance. The sizes of the symbols in the equation change along with the diagram of a wire.
The electrical resistance of a circuit component or device is defined as the ratio of the voltage applied to the electric current which flows through it: If the resistance is constant over a considerable range of voltage, then Ohm's law , I = V/R, can be used to predict the behavior of the material.
Review the concepts and formulas of current, resistance, and resistivity in DC circuits with Khan Academy's interactive exercises and videos.