Questions and Answers
What is the function of the power supply?
To take AC power from the wall socket and transform it into DC power to run the motherboard and other internal components.
What is an electron?
Negatively charged particles.
What is current?
The amount of electrons moving past a certain point on a wire.
What is a watt?
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What is an FRU?
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What are two types of current?
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What are the symbols used by multimeters to indicate DC and AC settings?
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What is the purpose of a continuity test?
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What devices can be used to protect a PC from faulty AC?
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What is the power conditioning feature of a UPS?
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What is surge suppression?
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What is the purpose of the P4 12V connector?
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How long does the ATX power supply remain on?
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What is the correlation between volts, amperes, and wattage?
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What is the soft power feature?
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What should be checked if a system doesn't seem to have power?
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A possible symptom of a power supply that is dying slowly?
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What is the use of splitters?
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How do fuses provide basic protection from overflow of electricity?
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What is the purpose of slot covers?
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What are the ways in which power supplies can fail?
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You begin troubleshooting a computer that does not start. The fan in the power supply does not turn on when the PC is plugged into a known good AC outlet. What would you do?
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What is the purpose of the exhaust fan in a computer case?
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What are the functions of the power supply fan?
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Where is the real on/off switch?
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What aspects of electric current can be measured using a multimeter?
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How do the electrons flow in DC versus AC?
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Describe a multimeter.
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You suspect that a wire has a break in it. What can you do to test your theory?
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How does a ground wire provide protection from overflow of electricity?
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Study Notes
Power Supply Unit Overview
- Transforms AC power from wall sockets into DC power for motherboards and internal components.
Basic Electrical Concepts
- Electrons are negatively charged particles essential for electricity flow.
- Current refers to the amount of electrons passing a specific point in a wire.
- Watts are calculated by multiplying volts (V) by amps (A), representing the power requirements of devices.
Types of Current
- Alternating Current (AC) allows electrons to flow in two directions, whereas Direct Current (DC) flows in one direction.
Measurement Tools
- Multimeters use symbols: V...̅ indicates DC and V~ indicates AC.
- Multimeters measure AC voltage, continuity, DC voltage, and resistance.
Power Supply Components and Functions
- FRU (Field Replaceable Unit) includes essential parts like RAM and hard drives that technicians should carry.
- UPS (Uninterruptible Power Supply) and surge suppressors protect PCs from faulty AC power.
- UPS features power conditioning, filtering AC power for smooth delivery to the PC.
- Surge suppression prevents voltage spikes by absorbing excess voltage.
Specific Connections and Features
- The P4 12V connector supplies power to the motherboard; the ATX power supply maintains 5 volts constantly to keep the motherboard powered.
- Splitters are used to create additional connections for powering multiple devices in a PC.
- The exhaust fan removes warm air from inside the computer case.
Power Supply Issues and Troubleshooting
- Symptoms of a failing power supply include system lock-ups, random crashes, and intermittent boot failures.
- If a power supply fan does not activate, check if the PC is turned on, and inspect or replace the power supply if necessary.
Protection Mechanisms
- Fuses protect circuits by breaking the internal wire when excessive electricity flows.
- Ground wires provide a safe path for excess current to minimize electric shock risks.
Maintenance and Safety
- Slot covers ensure airflow while preventing dust accumulation inside the components.
- The real on/off switch for the power supply is located at the back of the unit.
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Description
This quiz explores the fundamentals of power supply units and basic electrical concepts. It covers the transformation of AC power to DC, types of current, and essential measurement tools. Test your knowledge on power supply components and their functions.