In the context of resistors and Ohm's law, what is the SI unit of electrical resistance?

• A. watt ($W$)
• B. ohm ($\Omega$)
• C. ampere ($A$)
• D. volt ($V$)

Answer: (B)

Verified step by step guidance

1. Recall that electrical resistance is a measure of how much a material opposes the flow of electric current.
2. Ohm's law relates voltage (V), current (I), and resistance (R) through the formula \(R = \frac{V}{I}\).
3. Voltage (V) is measured in volts, and current (I) is measured in amperes (A).
4. Since resistance is voltage divided by current, its unit is volts per ampere, which is defined as the ohm (\(\Omega\)).
5. Therefore, the SI unit of electrical resistance is the ohm, symbolized by \(\Omega\).