A desktop computer equipped with basic hardware requires a power supply upgrade after inst… — CompTIA A+ (Core 1 & Core 2)

A desktop computer equipped with basic hardware requires a power supply upgrade after installing additional expansion components. The total peak power consumption of all internal components is calculated at $300\text{ W}$ . To maintain a recommended $20\%$ power headroom margin for system stability, which minimum wattage power supply unit (PSU) should be installed?

$360\text{ W}$ Cevap
B
$300\text{ W}$
C
$240\text{ W}$
D
$150\text{ W}$

Cevap

The minimum wattage power supply unit that should be installed is

360\text{ W}

The total system power requirement with a

20\%

headroom margin is calculated as

300\text{ W} \times 1.20 = 360\text{ W}

. This ensures stable operation under maximum load while protecting the system against transient power surges.

Adım Adım Çözüm

Identify total peak power draw of internal components

Total peak draw is

300\text{ W}

This establishes the baseline power required by the computer components.

Calculate the necessary overhead margin multiplier

20\%

headroom multiplier is

1 + 0.20 = 1.20

Adding a safety margin prevents power supply overload during power spikes and ensures long-term power supply efficiency.

Multiply total draw by headroom multiplier

300\text{ W} \times 1.20 = 360\text{ W}

This yields the total minimum wattage capacity needed for the replacement PSU.

Anahtar Kavram

Power supply sizing and headroom calculation

Soru

Cevap

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