220-1101 Question #155: Real Exam Question with Answer & Explanation

The correct answer is B: NFC. NFC (Near Field Communication) is a wireless technology where only one of the devices (the reader) needs to be actively powered, as passive NFC tags draw power from the reader's electromagnetic field.

Mobile devices

Question

Which of the following wireless technologies only requires one of the devices to be connected to a power source?

Options

ARFID
BNFC
CBluetooth
DZ-wave

Explanation

NFC (Near Field Communication) is a wireless technology where only one of the devices (the reader) needs to be actively powered, as passive NFC tags draw power from the reader's electromagnetic field.

Common mistakes.

A. RFID (Radio-Frequency Identification) is a broader category that includes both passive tags (which can be unpowered) and active tags (which require their own power source). NFC is a specific type of high-frequency passive RFID, but RFID itself is not exclusively passive.
C. Bluetooth devices, such as headsets or controllers, typically require both communicating devices to be powered by their own batteries or external power sources to establish and maintain a connection.
D. Z-Wave devices, commonly used in smart home automation, are generally active components that require their own power source, either battery or wired, to operate within the mesh network.

Concept tested. Wireless technology power requirements

Reference. https://developer.android.com/develop/connectivity/nfc/fundamentals

Topics

#NFC#Wireless technologies#Power requirements#Mobile device features

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