What best describes a voltage gradient?

What best describes a voltage gradient?

• A. Occurs when energized source creates an expanding gradient across the surface due to current emanating outward in decreasing voltage.
• B. A constant potential difference across two points on the ground.
• C. A measure of the resistance of soil to current.
• D. The maximum voltage drop along a power line.

Answer: (A)

Voltage gradient is about how electrical potential changes over distance in the surrounding space. When a source is energized, current flows outward and the voltage is highest near the source and decreases as you move away. That creates a spatial slope of the potential field—the gradient—that expands across the surface as distance from the source increases. This best matches the idea of an expanding gradient with current emanating outward in decreasing voltage. The other descriptions miss this spatial change aspect: a constant potential difference between two ground points doesn’t capture how voltage varies with distance, soil resistance is about how hard it is for current to flow rather than how voltage changes in space, and a maximum voltage drop along a power line refers to the line itself rather than the gradient of voltage in the surrounding area.

Voltage gradient is about how electrical potential changes over distance in the surrounding space. When a source is energized, current flows outward and the voltage is highest near the source and decreases as you move away. That creates a spatial slope of the potential field—the gradient—that expands across the surface as distance from the source increases. This best matches the idea of an expanding gradient with current emanating outward in decreasing voltage.

The other descriptions miss this spatial change aspect: a constant potential difference between two ground points doesn’t capture how voltage varies with distance, soil resistance is about how hard it is for current to flow rather than how voltage changes in space, and a maximum voltage drop along a power line refers to the line itself rather than the gradient of voltage in the surrounding area.