Mechanical and electrical calculator ::
A mechanical calculator is a device that performs mathematical calculations mechanically, without the use of electricity. The earliest mechanical calculators were developed in the 17th century and were based on the design of the abacus. These calculators used gears, wheels, and other mechanical components to perform addition, subtraction, multiplication, and division.
On the other hand, an electrical calculator uses electronic circuits to perform mathematical calculations. Electrical calculators can perform more complex calculations than mechanical calculators and are typically faster and more accurate. Electrical calculators can also store and retrieve data, whereas mechanical calculators cannot.
Modern calculators are usually electronic and combine both mechanical and electrical components. These calculators typically have a keyboard for inputting numbers and mathematical functions, a display for showing the results of calculations, and an internal processor that performs the calculations using electronic circuits. Some calculators also have the ability to graph functions, solve equations, and perform other advanced mathematical functions.
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