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# What are the units of current?

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The International System of Units has declared the ampere, or amp, the unit of electrical current. The symbol for ampere is "A." Electric current is defined as any type of flow of electricity or electrons through a medium.

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The flow of electrons through a medium, such as a wire, causes electricity to form. Electricity and electric current can be measured by Ohm's Law. This law exhibits the relationship between electric current, voltage and resistance. It states that electric current equals the amount of voltage multiplied by the total resistance of a medium. Current is measured in amps, voltage in volts and resistance in ohms. All three variables can be found by using Ohm's Law.

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## Related Questions

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When talking about electrical current, AC stands for "alternating current" and DC stands for "direct current." Alternating current is the type of current that comes from a power plant and outlet, in which the current changes directions rapidly. Direct current is the type of current that comes from a battery, where the current is always flowing in the same direction.

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Ballasts, such as those used in fluorescent lighting systems, prevent overheating by limiting the lamp's electrical current, according to Rensselaer Polytechnic Institute. Without a ballast, a lamp would not even be able to start.

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The difference is that a current traveling through a circuit flows constantly through conductors, typically in a low voltage but at a high rate of current. A static discharge is high voltage but low current, and occurs due to a build-up of opposite charges on objects separated by an insulator. This build-up occurs until the charge is so great that the electrons flow though the insulator to balance the charges.