What happens when you press a button on your calculator ? [Calculator Tricks Series]

Welcome to our new episode of the “Calculators Tricks ” Series .

Today , we will discover what happens when we press a button on your calculator .

Press down on one of the number keys on your calculator and a series of things will happen in quick succession:

As you press on the hard plastic, you compress the rubber membrane underneath it. This is a kind of a miniature trampoline that has a small rubber button positioned directly underneath each key and a hollow space underneath that. When you press a key, you squash flat the rubber button on the membrane directly underneath it.



  1. The rubber button pushes down making an electrical contact between two layers in the keyboard sensor underneath and the keyboard circuit detects this.
  2. The processor chip figures out which key you have pressed.
  3. A circuit in the processor chip activates the appropriate segments on the display corresponding to the number you’ve pressed.
  4. If you press more numbers, the processor chip will show them up on the display as well—and it will keep doing this until you press one of the operations keys (such as +, −, ×, ÷) to make it do something different. Suppose you press the + key. The calculator will store the number you just entered in a small memory called a register. Then it will wipe the display and wait for you to enter another number. As you enter this second number, the processor chip will display it digit-by-digit as before and store it in another register. Finally, when you hit the = key, the calculator will add the contents of the two registers together and display the result. There’s a little more to it than that—and I’ll go into a few more details down below.

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What is a Calculator? and what is inside it ? [ Calculator Tricks Series ] .

Welcome to a new post in the series of “Calculator Tricks ”

Today , we are gonna know why people need calculators in their study and work .

Also , we are going to know the internal components of a calculator .

So , I searched the web and reached these information and i am here today to tell you about what i found about this topic … i found these information on a website called “explain the stuff ”

First , Why do we need calculators ?

Can you remember Avogadro’s constant to six decimal places? Can you figure out the square root of 747 in less than a second? Can you add up hundreds of numbers, one after another, without ever making a mistake? Pocket calculators can do all these things and more using tiny electronic switches called transistors.

Our brains are amazingly versatile, but we find it hard to calculate in our heads because they can store only so many numbers. According to a famous bit of 1950s research by psychologist George Miller, we can remember typically 5–9 digits (or, as Miller put it: “the magical number seven, plus or minus two”) before our brains start to ache and forget. That’s why people have been using aids to help them calculate since ancient times. Indeed, the word calculator comes from the Latin calculare, which means to count up using stones.

Second , we want to know what is inside the calculator .

Mechanical calculators (ones made from gears and levers) were in widespread use from the late-19th to the late-20th century. That’s when the first affordable, pocket, electronic calculators started to appear, thanks to the development of silicon microchips in the late 1960s and early 1970s. Calculators have much in common with computers: they share much of the same historyand work in a similar way, but there’s one crucial difference: a calculator is an entirely human-operated machine for processing math, whereas a computer can be programmed to operate itself and do a whole range of more general-purpose jobs. In short, a computer is programmable and a calculator is not. (A programmable calculator sits somewhere between the two: you can program it, but only to do relatively simple mathematical calculations.)

If you’d taken apart a 19th-century calculator, you’d have found hundreds of parts inside: lots of precision gears, axles, rods, and levers, greased to high heaven, and clicking and whirring away every time you keyed in a number. But take apart a modern electronic calculator (I just can’t resist undoing a screw when I see one!) and you might be disappointed at how little you find. I don’t recommend you do this with your brand-new school calculator if you want to stay on speaking terms with your parents, so I’ve saved you the bother. Here’s what you’ll find inside:


  • Input: Keyboard: About 40 tiny plastic keys with a rubber membrane underneath and a touch-sensitive circuit underneath that.
  • Processor: A microchip that does all the hard work. This does the same job as all the hundreds of gears in an early calculator.
  • Output: A liquid crystal display (LCD) for showing you the numbers you type in and the results of your calculations.
  • Power source: A long-life battery (mine has a thin lithium “button” cell that lasts several years). Some calculators also have a solar cell to provide free power in the daylight.

And that’s about it!

stay tuned to know more about calculators and what you can do with your own calculator in order to make it easier to perform calculations and to solve a problem .

Find the full article HERE .