TestOut LabSim A+ Certification Practice Exam

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What is the function of the block (often called a brick) on a laptop power cord?

Stores extra power
Converts AC to DC
Acts as a surge protector
Provides heating for the laptop

The correct answer is: Converts AC to DC

The block on a laptop power cord, commonly referred to as a power adapter or brick, primarily serves the function of converting alternating current (AC) from a wall outlet into direct current (DC), which is needed for the operation of the laptop. Laptops are designed to run on DC power, while most household outlets supply AC power. The power adapter ensures that the voltage and current levels are appropriate for the laptop's requirements, allowing it to operate safely and efficiently. While power adapters can have additional features, such as some level of surge protection or overload protection, their main purpose is the conversion of power types. This is crucial for supporting the internal circuitry of the laptop, as using the wrong type of power could damage the device or lead to malfunctions.