Calculator Components If you've read the first page, then you're aware by this point that portable calculators need single-chip microprocessors to perform their functions. But how do you activate the microprocessor? It all starts with the information located on the outside of your device. The majority of modern calculators feature a sturdy plastic casing with small holes in the front to allow rubber to pass through, similar to a TV remote. By pressing a button, you complete a circuit underneath the rubber. It sends electrical impulses across a circuit board beneath. Those impulses are routed through the microprocessor, which processes the information and sends an output to the calculator's display screen. The displays in the early electronic calculators comprised of LEDs or light-emitting diodes . The latest models that require less power feature a the liquid crystal display or LCD. Instead of producing light LCDs alter light molecules to create a patter...
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