Pace IT - Power Supplies
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The document provides an introduction to power supplies, detailing the differences between alternating current (AC) and direct current (DC), and explaining the function of a PC power supply in converting AC to the appropriate DC voltages required for various components. It outlines key specifications such as common voltage requirements (+3.3v, +5v, +12v, and -12v) and connectors, while emphasizing the importance of considering form factor, voltage needs, and wattage when choosing a power supply. Additionally, it mentions that the content is funded by a grant from the U.S. Department of Labor and includes various policies on equal opportunity and accommodations.
Pace IT - Power Supplies
- 1. Introduction to the power supply.
- 2. Page 2 Instructor, PACE-IT Program – Edmonds Community College Areas of Expertise Industry Certifications PC Hardware Network Administration IT Project Management Network Design User Training IT Troubleshooting Qualifications Summary Education M.B.A., IT Management, Western Governor’s University B.S., IT Security, Western Governor’s University Entrepreneur, executive leader, and proven manger with 10+ years of experience turning complex issues into efficient and effective solutions. Strengths include developing and mentoring diverse workforces, improving processes, analyzing business needs and creating the solutions required— with a focus on technology.
- 3. Page 3 PACE-IT. – Alternating current vs. direct current. – PC power supplies. – Choosing a power supply.
- 4. Page 4 Introduction to the power supply.
- 5. Page 5 Introduction to the power supply. – Alternating current (AC). » The common source for AC is your wall socket, and the most standard unit of measurement is the volt (V). AC is used because it is the better medium for transmitting. » The flow of the electrical charge periodically reverses, which is represented by a wave. The reversal cycle is measured by the frequency of its change and is represented by its Hertz (Hz), which is the number of cycles per second. » The most common wall current in the United States and Canada is 110V – 120V @ 60 Hz. » The most common wall current in other countries is 220V – 230V @ 50Hz. – Direct current (DC). » The common source for DC is converted AC or batteries. » DC is a constant power; there is no reversal cycle. » DC works best for applications that need to store an electrical charge or that require the constant power characteristic of DC.
- 6. Page 6 Introduction to the power supply.
- 7. Page 7 Introduction to the power supply. – The power supply’s job description. » To take the AC wall current and change it to the appropriate DC current for the PC—and to do so in the right amount. » To supply those voltages through the appropriate style of connector. » Common PC component voltage requirements are: +3.3V, +5V, +12V, and -12V. – Power supplies are rated by the watts (W) they can supply. » The watt is a unit of measure for electricity. » Watts can be determined if you know the voltage and amperage (A) requirements. » V x A = W.
- 8. Page 8 Introduction to the power supply. – Common PC power connectors. » 24 pin main motherboard power connector (supplies +3.3V, +5V, +12V, and -12V). This is for most ATX form factors. » 20 pin main motherboard power connector (supplies +3.3V, +5V, +12V, and -12V). This is for Micro-ATX form factor. » 4 or 8 pin auxiliary motherboard power connector (supplies +12V). This supplies additional voltage to the CPU. » 4 pin Molex connector (supplies +5V and +12V). This is for some peripheral devices and fans. » Berg connector (supplies +5V and +12V). This is for floppy disk drives. » SATA connector (supplies +3.3V, +5V, and +12V). This is for some peripheral devices. » 6 or 8 pin PCIe auxiliary power connector (supplies +3.3V and +12V). This supplies more voltage to PCIe add-on cards that require it.
- 9. Page 9 Introduction to the power supply.
- 10. Page 10 Introduction to the power supply. – Know the form factor. » ATX, Micro-ATX, and ITX use different standard sizes. – Know the voltage requirements. » United States and Canada vs. most of the world. » Some power supplies can switch or be switched between standard voltages and some cannot. – Know what is going to be inside the case. » The type of motherboard, CPU, and the number and types of peripherals will make a difference in the connectors that are needed. – Know the wattage requirements. » It is better to have more watts available and not need them than to need more watts and not have them.
- 11. Page 11 AC power usually comes from a wall socket. The flow of the electrical charge periodically reverses. DC power usually is converted from AC or comes from a battery and supplies a constant electrical charge. AC is good for transmitting electricity over a distance, while DC is best for applications that need a constant charge (most electronics). Topic Alternating current vs. direct current. Summary The job of the PC power supply is to convert AC power into the proper DC voltages that a PC needs. Common PC voltage requirements are: +3.3V, +5V, +12V, and -12V. It does this through various types of plugs. PC power supplies. When choosing a power supply, there are several items that need to be considered. The form factor of the motherboard, the voltage requirements, and the amount and types of peripherals will make a difference. In addition, it is important to know the wattage requirements of the system. It is also better to have more watts than needed. Choosing a power supply. Introduction to the power supply.
- 13. This workforce solution was 100 percent funded by a $3 million grant awarded by the U.S. Department of Labor's Employment and Training Administration. The solution was created by the grantee and does not necessarily reflect the official position of the U.S. Department of Labor. The Department of Labor makes no guarantees, warranties, or assurances of any kind, express or implied, with respect to such information, including any information on linked sites and including, but not limited to, accuracy of the information or its completeness, timeliness, usefulness, adequacy, continued availability or ownership. Funded by the Department of Labor, Employment and Training Administration, Grant #TC-23745-12-60-A-53. PACE-IT is an equal opportunity employer/program and auxiliary aids and services are available upon request to individuals with disabilities. For those that are hearing impaired, a video phone is available at the Services for Students with Disabilities (SSD) office in Mountlake Terrace Hall 159. Check www.edcc.edu/ssd for office hours. Call 425.354.3113 on a video phone for more information about the PACE-IT program. For any additional special accommodations needed, call the SSD office at 425.640.1814. Edmonds Community College does not discriminate on the basis of race; color; religion; national origin; sex; disability; sexual orientation; age; citizenship, marital, or veteran status; or genetic information in its programs and activities.