Unit Information
Ohm
The SI derived unit of electrical resistance, named after German physicist Georg Simon Ohm. Defined as the resistance between two points of a conductor when a constant potential difference of one volt applied to these points produces a current of one ampere in the conductor. Fundamental to Ohm's law, which states that the current through a conductor is directly proportional to the voltage across it and inversely proportional to its resistance. Essential for characterizing conductive materials, circuit design, and electrical engineering applications worldwide.
Kiloohm
A metric multiple unit of electrical resistance equal to one thousand ohms (10³ Ω). Widely used in electronic circuit design, resistor specifications, and impedance matching applications. Essential for characterizing standard resistor values, voltage dividers, and signal conditioning circuits. Commonly employed in audio equipment, sensor interfaces, and control systems where specific resistance values are required for proper circuit operation and signal processing. Represents the typical range for many common electronic components and circuit elements in consumer and industrial electronics.
Conversion Tips
- Remember to check your decimal places for accuracy.
- This conversion is commonly used in international applications.
- Consider the context when choosing precision levels.
- Double-check calculations for critical applications.
Learn More About Electric_resistance
Scientific Overview
Electric resistance is the opposition to the flow of electric current through a material. It converts electrical energy into heat and is measured in ohms (Ω). Resistance depends on material properties, dimensions, and temperature.
Historical Background
Georg Simon Ohm formulated Ohm's Law in 1827, establishing the fundamental relationship between voltage, current, and resistance. The unit ohm is named after him.
Real-World Applications
Electronics
Resistors control current flow and divide voltages in circuits.
Electrical Engineering
Resistance calculations determine power losses in transmission lines.
Materials Science
Resistivity measurements identify materials and detect defects.
Temperature Sensing
Thermistors use resistance changes to measure temperature.
Interesting Facts
- Copper wire has very low resistance, making it ideal for electrical wiring.
- The human body has a resistance of about 100,000 ohms when dry.
- Superconductors have exactly zero electrical resistance below critical temperature.
- Carbon resistors can withstand high temperatures and are very stable.
Key Formulas
Resistance Definition
R = V/IResistivity
R = ρ·L/APower Dissipation
P = I²R = V²/RTemperature Dependence
R = R₀[1 + α(T - T₀)]