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College Physics (Urone)
Found in: Page 694

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Short Answer

Voltages are always measured between two points. Why?

"Potential difference" is another word for voltage. Because it is a relative quantity, it cannot be measured at a single spot. We use another point at infinity to calculate the potential difference at a single location. Thus, voltage is usually measured between two spots.

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Step by Step Solution

Step 1: Definition of Voltage

The amount of work done in carrying a unit positive charge from one point to another, I s called the potential difference or voltage between those two points.

Step 2 : Explaining why the voltages are always measured between two points

The electric potential helps us compare the potential energy between two points. As potential energy at a point has no absolute value, we can only calculate the change in Potential energy between two points. In the same way, the electric potential also does not have an absolute value at a particular point. We can only calculate the difference in potential between two points.

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