What is the unit of electrical resistance?

What is the unit of electrical resistance?

• A. Watt
• B. Volt
• C. Ohm
• D. Ampere

Answer: (C)

Resistance tells us how much a component resists the flow of electric current. The unit used for resistance is the ohm, symbolized by the Greek letter omega (Ω). This comes from Ohm’s law, which relates voltage, current, and resistance: V = I R. So if you apply one volt across a component that has one ohm of resistance, the current flowing through it is one ampere. In other words, one ohm equals one volt per ampere. It helps to keep straight how the other units fit in: volt measures electrical potential difference, ampere measures current, and watt measures power. Since those describe pressure, flow, and power rather than resistance, they aren’t units for resistance.

Resistance tells us how much a component resists the flow of electric current. The unit used for resistance is the ohm, symbolized by the Greek letter omega (Ω). This comes from Ohm’s law, which relates voltage, current, and resistance: V = I R. So if you apply one volt across a component that has one ohm of resistance, the current flowing through it is one ampere. In other words, one ohm equals one volt per ampere.

It helps to keep straight how the other units fit in: volt measures electrical potential difference, ampere measures current, and watt measures power. Since those describe pressure, flow, and power rather than resistance, they aren’t units for resistance.