The unit of electrical resistance is the:

**The reasoning** Electrical resistance measures how much a material *opposes* the flow of electric current. Think of it like friction in a pipe slowing down water flow. The unit named after German physicist Georg Ohm is the **Ohm (Ω)**. This comes directly from **Ohm's Law**: V = IR, where: - V (Voltage) is measured in Volts - I (Current) is measured in Amperes - R (Resistance) is measured in Ohms Rearranging: R = V/I. So 1 Ohm = 1 Volt per Ampere. If a resistor needs 1 volt to push 1 ampere through it, its resistance is 1 Ohm. **Why the wrong options tempt you** - **Volt (A)** measures electrical pressure/potential difference—the "push" that drives current - **Ampere (B)** measures the actual flow of charge (current)—how many electrons per second - **Watt (D)** measures electrical power (energy per second)—how fast energy is used: P = VI All four are electrical units, but they measure different things! **Quick takeaway** Remember: "**OHM** is the **O**pposition (resistance) that **H**inders **M**ovement of current"—while Volts push, Amperes flow, and Watts measure power consumed.