Electrical voltage

Voltage is a physical quantity that characterizes the potential difference between two points in an electric field and indicates how much work is required to move a unit charge from one point to another:

$$U = \frac{A}{q}$$


Aā€” work done by the electric field to move the charge;
qā€” charge.

The unit of voltage in the SI system is volt (V). Voltage is 1V when an electric field does 1 joule (1J) of work in moving one coulomb (1C).

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