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It is the opposite of DC, or direct current, and the electricity reverses direction back and fourth at regular intervals, generally multiple times per second. This alternation is measured in Hertz; in the United States and many other countries, AC power is generated at 60 Hertz, meaning the current alternates 60 times in a second. Read More…

AC Power Supply An AC power supply is a device that is used to produce AC power for other devices and pieces of equipment. AC, or alternating current, is the electricity that comes from a wall outlet and is used in residential and commercial buildings all over the world.
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Leading Manufacturers

Livermore, CA  |  800-669-8090

At Quail Electronics, we are your power cord specialists. Our power supplies consist of green dot cords, high voltage cords, North American and international cords, specialty cords, plus adapters, plugs and strips.

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Quail Electronics, Inc. $$$

Easton, PA  |  800-523-9478

For 4 decades, Acopian Technical Company has specialized in long lasting power supplies (0 volts – 30000 V). We offer AC power supplies, DC power supplies, AC to DC converters, uninterruptible power supply (UPS), AC to DC power supplies & high voltage power supplies. With quality customer service & technical support, we have thousands of power supplies for thousands of applications.

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Acopian Technical Company $$$

Sunnyvale, CA  |  800-844-1188

XP Power designs and manufactures multiple power supplies—AC/DC switching power supplies and DC/DC conversion products. If standard or modified standard products won't meet your needs, we can provide custom power supplies.

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XP Power $$$

York, PA  |  717-767-6511

Red Lion Controls is an internationally based manufacturer of control devices. We have state-of-the-art facilities, equipment and staff that make sure Red Lion products are built to the highest standards. We pride ourselves on the introduction of many new and exciting control products each year. Call us or visit our website today to find out more information.

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Red Lion Controls, Inc. $$$
placeholder image Quail Electronics, Inc. Acopian Technical Company XP Power Red Lion Controls, Inc.

Most power plants generate AC electricity rather than DC electricity. Power lines, held up by telephone poles that are connected to every residential building and most commercial, carry high voltages of AC power. However, the higher the voltage, the more insulation it requires. Most alternating power is converted inside buildings because many appliances only run on DC power, including printers, laptops, battery chargers and desktop computers.

Other electrical devices found in the home, like lamps, radios, fans, televisions and small appliances run off the electricity directly from the wall outlets, which is the AC power. In industrial applications, devices and machinery like generators, dynamotors, inverters and transformers all use AC power to operate. AC current can also be used in telecommunications to convey information instead of electricity. They are used in radio and telephone lines.



The wavelength of AC power is always a sine wave, which exhibits smooth, repetitive oscillation. The rate of changing direction is called the frequency, which is measured in Hertz. 50 Hertz, for example, refers to the number of back and fourth cycles each second. The frequency of the wave can be increased or decreased dramatically by a transformer, which increases the frequency when the wave must travel great distances.

AC power supplies generally have adjustable output settings for component response testing at different voltages, currents and frequencies, since each application requires different amounts of each because of many different factors, such as distance traveled and maximum voltage. These are also used in testing motors and other electrical equipment whose input valves may vary. AC power comes from a variety of configurations, including bench top, DIN rail, rack mounted and cabinet styles.

AC Power Supply Informational Video