How to Play Money Talks by Ac Dc
What Is DC or Direct Current?
Direct current (DC) is a type of electrical power commonly provided by solar cells and batteries. It differs from alternating current (AC) in the way electricity flows from the power source through wiring. Here's an explanation of DC and how it differs from AC.
DC Power Is Unidirectional
If you imagine electrical current like a line of vehicles driving down a highway, DC would look like a line of cars all traveling down a straight road in the same direction. When a DC circuit is open, DC power flows in one direction only in a constant stream of current.
AC, on the other hand, changes direction periodically. As the current reverses, the voltage also reverses. AC on an oscilloscope makes waves rather than flowing in a straight line. Think of a car leaving the highway to drive on the grass, making a curve, crossing back over the highway and curving on the grass on the other side only to cross back over the highway. Instead of following the highway, the car keeps crossing back and forth across the highway as the current moves slightly forward with each crossover.
DC Is Produced in Several Ways
DC is generated in several ways. Batteries provide direct current from chemical reactions inside the battery. Devices called commutators can make direct current from AC generators. AC can also be converted to DC with the use of a device called a rectifier. Voltage and current of DC may vary depending on the power source, but the direction of the flow stays the same.
DC Is Preferred for Some Applications
AC power is the type of power found in most wired structures. The current from your home outlets is provided by AC. DC is chosen for low-voltage applications including cell phone charging, hybrid and electric automotive applications, off-grid appliances, flat screen TVs _ where AC is converted to DC _ and flashlights. Solar panels produce DC power, and portable solar systems rely on DC power. Specialty applications that rely on DC power include sub-sea, high-voltage transmission lines. High-voltage direct current (HVDC) lines lose less current over long distances than AC lines. Also, HVDC lines can connect diverse AC systems together unlike straight AC lines. Even though DC is preferable to AC for long-distance lines, the extended HVDC transmission lines are less reliable and more expensive to maintain than long AC transmission lines.
AC Won Out Over DC for Structural Power
At one time, DC was considered as a power source for homes and businesses, but there were issues with converting DC to the high-voltage needed for transmission lines. Power stations would need to be located a mile or less from powered residences and businesses, so DC was considered impractical for mass power delivery to neighborhoods. AC won out as the power type to supply homes and businesses due to its more accessible high-voltage capabilities.
DC Offers a Constant Current Over Time
For low-voltage operations, DC is the best option. DC sources provide consistent voltage over time. As battery power depletes in a DC circuit, the voltage drops, but the flow remains constant. Both DC and AC power have their place in electrical service, and the two types of current can work together to solve humankind's pressing power issues.
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