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Questions and Answers
What is the formula for electrical resistance?
What is the relationship between electric current and potential difference according to Ohm's law?
What is the relationship between conductance and resistivity?
What is the definition of electrical conductivity?
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What is the motion of electrons due to thermal energy?
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What is the relationship between electrical resistance and resistivity?
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What is the relationship between electrical conductivity and resistivity?
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What is the relationship between electric current and potential difference according to Ohm's law?
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What is the relationship between conductance and resistance?
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What is the effect of temperature on electric current according to Ohm's law?
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Study Notes
Electrical Resistance and Related Concepts
- The formula for electrical resistance is R = ρ × L / A, where R is the resistance, ρ is the resistivity, L is the length, and A is the cross-sectional area of the conductor.
- According to Ohm's law, the electric current (I) is directly proportional to the potential difference (V) and inversely proportional to the resistance (R), expressed as I = V / R or V = I × R.
- Conductance (G) is the reciprocal of resistance (R), i.e., G = 1 / R.
- Resistivity (ρ) is inversely proportional to conductance (G), i.e., ρ = 1 / G.
- Electrical conductivity (σ) is the reciprocal of resistivity (ρ), i.e., σ = 1 / ρ.
- The motion of electrons due to thermal energy is known as thermal agitation or random motion.
- Electrical resistance (R) is directly proportional to resistivity (ρ) and length (L) of the conductor, and inversely proportional to its cross-sectional area (A), i.e., R = ρ × L / A.
- Electrical conductivity (σ) is inversely proportional to resistivity (ρ), i.e., σ = 1 / ρ.
- There is no effect of temperature on electric current according to Ohm's law, as it is a linear relationship between voltage and current.
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Description
Test your knowledge of electric current, Ohm's Law, and electrical resistance with this quiz. Explore the relationship between electric current, potential difference, and resistance in conducting materials.
