It seems like you're looking for information about resistance and Ohm's law with direct sources. Here's a breakdown of resistance and Ohm's law, along with references to reliable sources for further reading:
1. Resistance:
Resistance is a fundamental property of materials that determines how much they oppose the flow of electric current. It is measured in ohms (Ω) and is denoted by the symbol "R". The resistance of a conductor depends on its length, cross-sectional area, material, and temperature. The formula for calculating resistance is:
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Resistance (R) = ρ * (Length / Cross-sectional Area)
Where:
ρ (rho) is the resistivity of the material (a constant characteristic of the material).
Length is the length of the conductor.
Cross-sectional Area is the area through which current flows.
Sources for Resistance:
The Physics Classroom: "Resistance and Resistivity": This resource provides a comprehensive explanation of resistance and resistivity with interactive simulations and examples. Link
2. Ohm's Law:
Ohm's law is a fundamental principle in electronics that describes the relationship between voltage, current, and resistance. It states that the current passing through a conductor between two points is directly proportional to the voltage across the two points, and inversely proportional to the resistance between them. Mathematically, Ohm's law can be expressed as:
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Voltage (V) = Current (I) * Resistance (R)
This equation can be rearranged to solve for different quantities: I = V / R and R = V / I.
Sources for Ohm's Law:
HyperPhysics - Georgia State University: "Ohm's Law": This resource provides a clear explanation of Ohm's law, along with practical examples and applications. Link
These sources should give you a solid understanding of resistance and Ohm's law. Remember that these concepts are fundamental to electronics and electrical engineering, and you can explore further based on your specific interests and needs.