Answer:
Microprocessor
Explanation:
A microprocessor is a programmable chip that incorporates in itself the functions of a computer's central processing unit. It contains millions of small components such as transistors and resistors. In fact, the microprocessor is sometimes called the CPU itself as it contains an Arithmetic Logic Unit(ALU), a control unit and register array.
They work at a very high speed due to the components that they contain and are available at relatively low cost. They are portable, reliable and compared to vacuum tubes, they generate less heat.
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