Unit | Resistance

The ohm is defined by , which is usually written as: V = I × R V = Voltage (Volts) I = Current (Amperes) R = Resistance (Ohms)

Because resistance can vary wildly, you’ll often see these prefixes: 1,000 ohms Megohm (MΩ): 1,000,000 ohms resistance unit

Think of electricity flowing through a wire like water flowing through a pipe. Resistance is essentially the "friction" or the narrowness of the pipe that slows the water down. In a circuit, resistance limits the flow of electrons. The Math: Ohm’s Law The ohm is defined by , which is

Not all materials are equal. Conductors (like copper) have very low resistance, while insulators (like rubber) have extremely high resistance. Common Multiples The Math: Ohm’s Law Not all materials are equal

In the world of electronics and physics, the (symbol: Ω ) is the standard unit of electrical resistance. It is named after Georg Simon Ohm, a German physicist who discovered the relationship between voltage, current, and resistance. What is Resistance?