Which of the following statements describes circuit boards?
They have billions of tiny switches
They operate according to the decimal system
They have been replaced in modern computers by hard drives
They make the keyboard function properly
The correct statement that describes circuit boards is: "They have billions of tiny switches."
Circuit boards, also known as printed circuit boards (PCBs), are flat boards made of insulating material such as fiberglass, with a layer of conductive material etched onto the surface. The conductive pathways on the board are used to connect different electronic components together and create a circuit. These pathways are formed by tiny switches called transistors that are integrated into the circuit board.
Circuit boards are used in various electronic devices, including computers, smartphones, televisions, and many other electronic gadgets. They play a crucial role in controlling the flow of electric signals and enabling the proper functioning of these devices.
To arrive at the correct answer, you can examine each statement and eliminate the ones that do not accurately describe circuit boards.
- The statement "They operate according to the decimal system" is incorrect. Circuit boards do not operate based on the decimal system; they function based on electronic signals and logic states (such as high and low voltage levels).
- The statement "They have been replaced in modern computers by hard drives" is also incorrect. Circuit boards are still an integral part of modern computers and are necessary for the proper functioning of various components, including the hard drive itself.
- Finally, the statement "They make the keyboard function properly" is not a comprehensive description of circuit boards. While circuit boards are involved in the operation of keyboards, they are not solely responsible for it. Other components, such as microcontrollers and keys, also contribute to the keyboard's functionality.
Therefore, after evaluating all the statements, the accurate description of circuit boards is that they have billions of tiny switches.