HomeElectrical SuppliesPower Supplies & AC/DC These durable, reliable power supplies and AC/DC converters from BK Precision are ideal for telecommunications, general electronic field service, school electronics, laboratory testing, powering up hobbyist's projects, and many other applications. For the DC Switching supply, choose from three different models to meet your DC voltage needs. What's the difference between AC, DC power? AC Power vs DC Power [Insert joke about the rock band here] You've probably heard the term “AC/DC” and figured it had something to do with electricity, but maybe you didn't know much else. If you ask any random person you meet about electricity, they may give an answer like “It's that magical lightning stuff that makes my lights turn on and my computer do things,” and if they want to sound smart they may include an anecdote about Benjamin Franklin flying a kite with a key tied to it during a lightning storm. Which, of course, is why instead of power lines, we all have kites with keys tied to them attached to our houses, just waiting for that stormy day to give us our much needed power.

If you ask any random person you meet about AC/DC in particular, there's a 99% chance they'll mention the Australian rock band that gave us such thought-provoking hits as “Highway to Hell”, “Hell’s Bells” and probably some other songs with Hell in the title. Fun fact: the band's name comes from the sister of band members Malcolm and Angus Young, who saw the initials on a sewing machine. To the band, it symbolizes the “raw power” of their music. There, now you have something to talk about at your next social gathering. But for realsies, what's the actual meaning behind AC/DC? What's the difference between them? Well, you're here already, so we may as well tell you. What is AC Power? AC stands for alternating current, which means the electrical current frequently reverses direction. AC electricity is measured according to its cycles, with one complete cycle being counted each time a given current travels in one direction and then doubles back on itself. Like it's doing laps in the most dangerous swimming pool ever.

An electrical current is able to complete many cycles per second, and is then given its frequency rating based on that number. The unit of measurement for an electric cycle is “Hertz” (Hz), not to be confused with the Hertz Donut (Hz DnT), which is not nearly as delicious as it sounds. The typical frequency in North America is 60 hertz (Hz), which indicates that the current is performing 60 cycles per second. In Europe and many other countries, they usually stick to 50 hertz. Shut up, that's why! No, I dunno, it's probably the same reason they spell some words differently in the United Kingdom. AC power is the type of electricity most commonly used in homes and offices, and is extremely versatile because its voltage can be changed through a transformer to suit a variety of transmission needs. What is DC Power? DC is the abbreviation for District of Columbia, and it's a type of electricity that gets paid a lot of money by lobbyists to sit around and not do anything important.

Just kidding, DC is actually short for direct current, which is a type of electrical current that travels through a circuit in only one direction. So instead of doing laps like our athletic friend AC, DC gets from one end of the pool to the other and says “Ehh, screw it.” This is the type of electrical power that is produced by fuel cells, batteries, and generators equipped with commutators. 3 ton all in one ac unitWhile DC power was the first type of electricity to be commercially transmitted, it has been widely replaced by alternating current (AC) electricity, and is now used primarily in electrochemical and metal-plating applications.single unit heating air conditioning So when you see “AC/DC” it refers to a device that will run on either type of current.how to fix split unit ac

For the computer, see Saturn Launch Vehicle Digital Computer. Direct Current (red line). The horizontal axis measures time; the vertical, current or voltage. Direct current (DC) is the unidirectional flow of electric charge. Direct current is produced by sources such as batteries, power supplies, thermocouples, solar cells, or dynamos. Direct current may flow in a conductor such as a wire, but can also flow through semiconductors, insulators, or even through a vacuum as in electron or ion beams. The electric current flows in a constant direction, distinguishing it from alternating current (AC). A term formerly used for this type of current was galvanic current. The abbreviations AC and DC are often used to mean simply alternating and direct, as when they modify current or voltage. Direct current may be obtained from an alternating current supply by use of a rectifier, which contains electronic elements (usually) or electromechanical elements (historically) that allow current to flow only in one direction.

Direct current may be converted into alternating current with an inverter or a motor-generator set. Direct current is used to charge batteries and as power supply for electronic systems. Very large quantities of direct-current power are used in production of aluminum and other electrochemical processes. It is also used for some railways, especially in urban areas. High-voltage direct current is used to transmit large amounts of power from remote generation sites or to interconnect alternating current power grids. The first commercial electric power transmission (developed by Thomas Edison in the late nineteenth century) used direct current. Because of the significant advantages of alternating current over direct current in transforming and transmission, electric power distribution is nearly all alternating current today. In the mid-1950s, high-voltage direct current transmission was developed, and is now an option instead of long-distance high voltage alternating current systems.

For long distance underseas cables (e.g. between countries, such as NorNed), this DC option is the only technically feasible option. For applications requiring direct current, such as third rail power systems, alternating current is distributed to a substation, which utilizes a rectifier to convert the power to direct current. See War of Currents. The term DC is used to refer to power systems that use only one polarity of voltage or current, and to refer to the constant, zero-frequency, or slowly varying local mean value of a voltage or current.[4] For example, the voltage across a DC voltage source is constant as is the current through a DC current source. The DC solution of an electric circuit is the solution where all voltages and currents are constant. It can be shown that any stationary voltage or current waveform can be decomposed into a sum of a DC component and a zero-mean time-varying component; the DC component is defined to be the expected value, or the average value of the voltage or current over all time.

Although DC stands for "direct current", DC often refers to "constant polarity". Under this definition, DC voltages can vary in time, as seen in the raw output of a rectifier or the fluctuating voice signal on a telephone line. Some forms of DC (such as that produced by a voltage regulator) have almost no variations in voltage, but may still have variations in output power and current. A direct current circuit is an electrical circuit that consists of any combination of constant voltage sources, constant current sources, and resistors. In this case, the circuit voltages and currents are independent of time. A particular circuit voltage or current does not depend on the past value of any circuit voltage or current. This implies that the system of equations that represent a DC circuit do not involve integrals or derivatives with respect to time. If a capacitor or inductor is added to a DC circuit, the resulting circuit is not, strictly speaking, a DC circuit. However, most such circuits have a DC solution.

This solution gives the circuit voltages and currents when the circuit is in DC steady state. Such a circuit is represented by a system of differential equations. The solution to these equations usually contain a time varying or transient part as well as constant or steady state part. It is this steady state part that is the DC solution. There are some circuits that do not have a DC solution. Two simple examples are a constant current source connected to a capacitor and a constant voltage source connected to an inductor. In electronics, it is common to refer to a circuit that is powered by a DC voltage source such as a battery or the output of a DC power supply as a DC circuit even though what is meant is that the circuit is DC powered. This symbol which can be represented with Unicode character U+2393 (​⎓​) is found on many electronic devices that either require or produce direct current. DC is commonly found in many extra-low voltage applications and some low-voltage applications, especially where these are powered by batteries or solar power systems (since both can produce only DC).

Most electronic circuits require a DC power supply. Domestic DC installations usually have different types of sockets, connectors, switches, and fixtures from those suitable for alternating current. This is mostly due to the lower voltages used, resulting in higher currents to produce the same amount of power. It is usually important with a DC appliance to observe polarity, unless the device has a diode bridge to correct for this. Most automotive applications use DC. The alternator is an AC device which uses a rectifier to produce DC. Usually 12 V DC are used, but a few have a 6 V (e.g. classic VW Beetle) or a 42 V electrical system. Through the use of a DC-DC converter, higher DC voltages such as 48 V to 72 V DC can be stepped down to 36 V, 24 V, 18 V, 12 V, or 5 V to supply different loads. In a telecommunications system operating at 48 V DC, it is generally more efficient to step voltage down to 12 V to 24 V DC with a DC-DC converter and power equipment loads directly at their native DC input voltages, versus operating a 48 V DC to 120 V AC inverter to provide power to equipment.

Many telephones connect to a twisted pair of wires, and use a bias tee to internally separate the AC component of the voltage between the two wires (the audio signal) from the DC component of the voltage between the two wires (used to power the phone). Telephone exchange communication equipment, such as DSLAMs, uses standard −48 V DC power supply. The negative polarity is achieved by grounding the positive terminal of power supply system and the battery bank. This is done to prevent electrolysis depositions. Main article: High-voltage direct current High-voltage direct current (HVDC) electric power transmission systems use DC for the bulk transmission of electrical power, in contrast with the more common alternating current systems. For long-distance transmission, HVDC systems may be less expensive and suffer lower electrical losses. Applications using fuel cells (mixing hydrogen and oxygen together with a catalyst to produce electricity and water as byproducts) also produce only DC.