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The first electronic digital computer contained Electronic valves.

In electronics, a vacuum tube, an electron tube, or colloquially a tube (North America) or valve (British usage), is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied.

In computer science, a digital electronic computer is a computer machine which is both an electronic computer and a digital computer. Examples of a digital electronic computers include the IBM PC, the Apple Macintosh as well as modern smartphones.

Vacuum tube. Alternatively referred to as an electron tube or valve and first developed by John Ambrose Fleming in 1904. The vacuum tube is a glass tube that has its gas removed, creating a vacuum. Vacuum tubes contain electrodes for controlling electron flow and were used in early computers as a switch or an amplifier

It represents the decimal numbers through a string of binary digits is true for the digital computer.

As we have seen in this Binary Numbers section of tutorials, there are many different binary codes used in digital and electronic circuits, each with its own specific use.

As we naturally live in a decimal (base-10) world we need some way of converting these decimal numbers into a binary (base-2) environment that computers and digital electronic devices understand, and binary coded decimal code allows us to do that.

We have seen previously that an n-bit binary code is a group of “n” bits that assume up to 2n distinct combinations of 1’s and 0’s. The advantage of the Binary Coded Decimal system is that each decimal digit is represented by a group of 4 binary digits or bits in much the same way as Hexadecimal. So for the 10 decimal digits (0-to-9) we need a 4-bit binary code.

A computer with CPU speed around 100 million instructions per second & with the word length of around 64 bits is known as Super computer.

A supercomputer is a computer with a high level of performance compared to a general-purpose computer. Performance of a supercomputer is measured in floating-point operations per second (FLOPS) instead of million instructions per second (MIPS). As of 2017, there are supercomputers which can perform up to nearly a hundred quadrillion FLOPS. As of November 2017, all of the world's fastest 500 supercomputers run Linux-based operating systems. Additional research is being conducted in China, the United States, the European Union, Taiwan and Japan to build even faster, more powerful and more technologically superior exascale supercomputers.

The country unveiled the world's fastest supercomputer, the Sunway TaihuLight (above). This year, according to state news agency Xinhua, the government has set its sights on completing the world's first prototype exascale computer; a machine capable of making a billion billion calculations per second.

EDVAC is a kind of digital computer. it is abbreviated as Electronic Discrete Variable Automatic Computer. It was a binary serial computer with automatic  addition, subtraction, multiplication and division. It's average addition time was 864 microseconds

All electronic computers are digital computers statement is false.

All kinds of computers, whether they are digital or analog, and electronic or non-electronic, can be Turing complete if they have sufficient memory. ... A digital computer can perform its operations in the decimal system, in binary, in ternary or in other numeral systems.

Digital computer. Digital computer, any of a class of devices capable of solving problems by processing information in discrete form. It operates on data, including magnitudes, letters, and symbols, that are expressed in binary code—i.e., using only the two digits 0 and 1.

Computer is an electronic device or combination of electronic devices. ... A computer can, not only store and process data but also retrieve data i.e. take out data from its memory or storage as and when desired.

Analog computer works on the supply of Continuous electrical pulses.

An analog computers, works by measuring voltages and currents rather than by the process of counting. An analog computers works on supply of continuous electrical signals and display outputs continuously. Side rule is an example analog device in which numbered as expressed as distances.

A computer that operates with numbers represented by directly measurable quantities (such as voltages or rotations) — compare digital computer, hybrid computer. This contrasts with an analog signal, which represents continuous values; at any given time it represents a real number within a continuous range of values.

A digital computer did not score over an analog computer in terms of Accuracy.

The definition of a digital computer is the most commonly used type of computer and is used to process information with quantities using digits, usually using the binary number system. An example of a digital computer is a MacBook.

Digital computers are programmable machines that use electronic technology to generate, store and process data. This computer fills the space between the mainframe and microcomputer This may also be called a mid-range computer.

The basic difference between analog and digital computers is the type of data they process. ... Digital computer process data which is binary, i.e. in the form of 0 and 1. Analog computers operate on mathematical variables in the form of physical quantities that are continuously varying.

Digital devices are Digital Clock.

All data that a computer processes must be encoded digitally, as a series of zeroes and ones. The opposite of digital is analog. A typical analog device is a clock in which the hands move continuously around the face. ... Most analog events, however, can be simulated digitally.

Digital clocks typically use the 50 or 60 hertz oscillation of AC power or a 32,768 hertz crystal oscillator as in a quartz clock to keep time. Some timepieces, such as many digital watches, can be switched between 12-hour and 24-hour modes.

The earliest patent for a digital alarm clock was registered by D.E Protzmann and others on October 23, 1956, in the United States. Protzmann and his associates also patented another digital clock in 1970, which was said to use a minimal amount of moving parts.

The device used to carry digital data an analog lines is called as Modulator.

An analog-to-digital converter, or ADC as it is more commonly called, is a device that converts analog signals into digital signals. ... One example is a modem which turns signals from digital to analog before transmitting those signals over communication lines such as telephone lines that carry only analog signals.

A modulator is a device that performs modulation. A demodulator (sometimes detector or demod) is a device that performs demodulation, the inverse of modulation. A modem (from modulator–demodulator) can perform both operations.

This process of imposing an input signal onto a carrier wave is called modulation. ... This is called amplitude modulation or AM. Frequency of an input signal can also be changed. If this input signal is added to the pure carrier wave, it will thereby change the frequency of the carrier wave.

A high quality CAD system uses the Digital plotter for printing drawing and graphs.

A digital plotter is a computer output device which draws curves and other computer graphics data on ordinary 8-1/2 × 11 inch (21.6 × 27.9 cm) paper. See Fig. 2-24.

Data from the computer is translated into signals which cause tiny incremental movements of the plotter's pen. The pen on the plotter (a felt-tip ink pen) is moved by a combination of X and Y carriage motions. The pen can move in eight different directions. These eight directions are used to simulate all the movements necessary to create curves. Since the incremental movement of the plotter is small (0.005 inch or 127μm) proper selection of directional moves combine into what the eye perceives as a smooth curve or line.

The plotter is a computer printer for printing vector graphics. In the past, plotters were used in applications such as computer-aided design, though they have generally been replaced with wide-format conventional printers. A plotter gives a hard copy of the output. It draws pictures on a paper using a pen.