What is the unit of electrical resistance?

What is the unit of electrical resistance?

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

Answer: (B)

Resistance is about how much a component opposes the flow of current. In circuits, the relationship between voltage, current, and resistance is described by V = I × R. The unit that makes this relationship simple is the ohm, which is defined so that one volt of potential difference across a conductor that carries one ampere of current corresponds to one ohm of resistance. Put another way, R equals V divided by I, so the ohm is volts per ampere. This ties the concept directly to how much voltage is needed to push a certain current through a component. The other options measure different things: volt is voltage, watt is power, and ampere is current.

Resistance is about how much a component opposes the flow of current. In circuits, the relationship between voltage, current, and resistance is described by V = I × R. The unit that makes this relationship simple is the ohm, which is defined so that one volt of potential difference across a conductor that carries one ampere of current corresponds to one ohm of resistance. Put another way, R equals V divided by I, so the ohm is volts per ampere. This ties the concept directly to how much voltage is needed to push a certain current through a component. The other options measure different things: volt is voltage, watt is power, and ampere is current.