Resistance Converter
Convert between different units of electrical resistance measurement including ohms, kilohms, megohms, abohms, statohms, and more. Essential for electrical engineering and electronics applications.
Common Resistance Conversions
⚡ Resistance Fundamentals
Definition: Opposition to electric current flow (Ω = V/A)
Conductance: Reciprocal of resistance (G = 1/R, measured in Siemens)
Temperature Effect: Most materials' resistance changes with temperature
AC vs DC: Impedance (Z) includes reactance for AC circuits
Power Dissipation: P = I²R = V²/R (Joule heating)
🔬 Resistance by Application
🎯 Resistor Color Codes & Standards
Standard Values: E12 series (10%, 12 values/decade), E24 series (5%)
Power Ratings: 1/4W, 1/2W, 1W, 2W common for through-hole
Tolerance: ±1%, ±5%, ±10% typical for general purpose
Temperature Coefficient: Usually specified in ppm/°C
🧮 Key Formulas & Relationships
Ohm's Law: R = V/I
Series: R_total = R₁ + R₂ + R₃ + ...
Parallel: 1/R_total = 1/R₁ + 1/R₂ + 1/R₃ + ...
Power: P = V²/R = I²R
Resistivity: R = ρL/A (ρ = resistivity, L = length, A = area)
🔬 Quantum & Special Resistances
Quantum Resistance: RK = h/e² ≈ 25,812.807 Ω
Hall Effect: Used in quantum Hall effect measurements
Josephson Junction: Zero resistance in superconductors
Planck Impedance: √(μ₀/ε₀) ≈ 376.7 Ω (impedance of free space)
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