Invisible carriers of information in electronic devices are what?

• A. Electrical Signals
• B. Magnetic Fields
• C. Optical Signals
• D. Acoustic Waves

Answer: (A)

Information in electronic devices is carried by electrical signals—variations in voltage and current that encode data. These signals are invisible because they are just electrical quantities flowing through circuits, not physical objects you can see.

Data is encoded as different voltage levels or pulse patterns, and the electronics interpret these changes to process or transmit information. Magnetic fields are related to current and are important in certain components like transformers or storage memories, but they’re not the primary carrier of information in most everyday electronics—the actual data moves as electrical signals. Optical signals do carry information in many communication systems, but inside typical electronic devices the signal path is usually electrical, and light-based transmission requires separate components to convert electrical signals to photons and back. Acoustic waves aren’t used as the general information carrier in electronics either; they’re used in specialized sensing or ultrasonic applications.

So the best answer reflects that the invisible carriers of information in electronic devices are electrical signals.