Electrical Units

Electrical current is the flow of charged particles, e.g., of electrons through a wire or of ions through a cell membrane. The number of particles moving per unit time is measured in amperes (A). Electrical current cannot occur unless there is an electrical potential difference, in short also called potential, voltage, or tension. Batteries and generators are used to create such potentials. Most electrical potentials in the body are generated by ionic flow (^ p. 32). The volt (V) is the SI unit of electrical potential (^ Table 1).

How much electrical current flows at a given potential depends on the amount of electrical resistance, as is described in Ohm's law

Some important Kelvin, Celsius, and Fahrenheit temperature equivalents:

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