In the context of resistors and Ohm's law, a unit of electric resistance is called a(n):

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

Answer: (B)

Verified step by step guidance

1. Understand that electric resistance is a measure of how much a material opposes the flow of electric current.
2. Recall Ohm's law, which relates voltage (V), current (I), and resistance (R) through the formula \(V = I \times R\).
3. Identify the unit of voltage as volts (V), the unit of current as amperes (A), and the unit of power as watts (W).
4. Recognize that the unit of resistance is derived from Ohm's law by rearranging it to \(R = \frac{V}{I}\), which means resistance is measured in volts per ampere.
5. Know that the standard unit of electric resistance is called the ohm, symbolized by the Greek letter omega (\(\Omega\)).