CompTIA Network+ Practice Test

What type of power do most electronic devices commonly use?

1. Alternating Current (AC)

2. Direct Current (DC)

3. Both AC and DC equally

4. High Voltage AC

The correct answer is: Direct Current (DC)

Most electronic devices commonly use Direct Current (DC) because many components, such as integrated circuits, microcontrollers, and low-power devices, require a stable and continuous voltage for proper operation. DC provides this consistent voltage level, enabling these components to function properly without the fluctuations that are inherent in Alternating Current (AC). In contrast, while AC is often used for power distribution in homes and businesses, electronic devices need a stable power source to eliminate the potential for damage or erratic behavior caused by varying voltage levels. Devices like laptops, smartphones, and LED lights often use AC to DC converters to supply the required voltage. The choice of "Both AC and DC equally" is less accurate since while some devices could utilize both forms of power in different stages, the majority of portable and compact electronic devices predominantly operate on DC power after conversion from AC. High Voltage AC is typically not directly used in consumer electronic devices due to safety concerns and the need for conversion to a safer voltage level for electronic operations.