Q:

What are the units of current?

A:

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.

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

  • Q:

    How are current and voltage related?

    A:

    Voltage, or electrical pressure, in a system produces a proportionate amount of current when placed across electrical resistance. Ohm's law indicates that 1 volt passed through 1 ohm of resistance produces 1 ampere of current, or electrical flow. Voltage and current, therefore, have a direct relationship most of the time.

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  • Q:

    How does an electrical transformer work?

    A:

    Transformers have two sets of wires wound around an iron core, and they use electromagnetic induction to increase or decrease electrical current. The primary wires magnetize the iron after the application of current, and the secondary wires use the magnetic induction to create an output current. The increase or decrease of output current depends on how many times the input and output wires wind around the core.

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  • Q:

    Why do tall buildings have lightning conductors?

    A:

    Tall buildings have lightning conductors to help transport the electrical current from a lightening strike to the ground safely. This protects the structure's electrical equipment and the materials used within the building.

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  • Q:

    Why is salt water a good conductor?

    A:

    When salt dissolves in water, negative and positive ions are pulled in opposite ways by an electrical field, which creates an electrical current. The ions that are created include sodium, which has a positive change, and chloride, which has a negative charge.

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