About Electric Resistance
Electric resistance is the opposition to the flow of electric current through a conductor. It is measured in ohms (Ω) and is fundamental to understanding electrical circuits and power dissipation according to Ohm's Law (V = IR).
Applications
- • Electronic component specifications
- • Circuit design and analysis
- • Power calculations and heat dissipation
- • Electrical safety and protection
- • Material characterization
- • Sensor and measurement systems
Typical Resistance Values
- • Copper wire (1m): ~0.02 Ω
- • LED resistor: 220-1000 Ω
- • Pull-up resistor: 1-10 kΩ
- • Human body: 1-100 kΩ
- • Insulator: >1 MΩ
- • Precision resistor: 1 Ω to 10 MΩ
Ohm's Law
Resistance is defined by Ohm's Law: R = V/I, where V is voltage and I is current. One ohm is the resistance that allows one ampere of current to flow when one volt is applied. Resistance causes electrical energy to be converted to heat.