Step 1: Understanding the Concept:
Electrical resistance is a fundamental property that quantifies how much an object opposes the flow of electric current.
Step 2: Key Formula or Approach:
According to Ohm's law, resistance \( (R) \) is defined as the ratio of voltage \( (V) \) across an object to the current \( (I) \) flowing through it.
The formula is given by \( R = \frac{V}{I} \).
Step 3: Detailed Explanation:
The standard SI unit for electrical resistance is the Ohm, which is symbolized by the Greek letter Omega \( (\Omega) \).
One Ohm is defined as the resistance between two points of a conductor when a constant potential difference of one Volt produces a current of one Ampere.
Let us analyze the other units given in the options.
Volt is the standard unit of electrical potential or electromotive force.
Ampere is the standard unit of electrical current.
Watt is the standard unit of electrical power.
Step 4: Final Answer:
Thus, the unit of measure for electrical resistance is the Ohm.