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17 May, 2007
V=I*R - Voltage, Amps (Amperes) & Resistance (Ohms)

The Relationship Between Voltage & Current

Georg Simon Ohm discovered that the amount of current that flows through a material is proportional to the potential difference or voltage applied across it. His famous law states that V = IR; if a certain voltage (V) is applied across a conductor, the size of the current (I) which flows is inversely proportional to the resistance (R) of the conductor.

The Ampere

The SI base unit for electrical quantities is the ampere. The definition of the ampere adopted in 1948, is: The ampere is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 metre apart in vacuum, would produce between these conductors a force equal to 2 x 10- 7 newtons per metre of length.

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Written at Thursday, May 17, 2007 by Andy Mahoney.
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