In computers, circuits allow for simple logical and mathematical operations using electricity. Which term best fits this description?

• A. Power supply
• B. Circuit
• C. Processor
• D. Transistor

Answer: (B)

Circuits are arrangements of electrical components through which electricity can flow to perform basic logical and mathematical tasks. They are the actual building blocks that implement operations like turning signals on or off, adding binary numbers, or comparing inputs by using logic gates such as AND, OR, and NOT. The reason this term fits best is that a circuit describes the configuration that carries out those operations, whereas a power supply merely provides energy, a transistor is just one building block that can be part of a circuit, and a processor is a complex device made from many circuits working together to run programs. So the description points to a circuit as the thing that directly enables simple logical and arithmetic operations.