In today's world computer is a necessary requirement not only for the people related to business but other fields as well and because of that we see computers everywhere nowadays. Computer are gradually becoming a part of our lives. We can classify computers on the basis of construction. We can classify computers in three sections and discuss them separately.
Digital computers work on the basis of two states, that is, "0" and "1" representing "OFF" and "ON" respectively. In fact, digital computers use electronic circuits, which can be distinguished by two values. Examples of digital computers are digital watches, digital scales and calculators, etc.
1. Digital Computers:
2. Analog Computers:
These computers work on the basis of signals. A thermometer is an analog device. Analog computers measure physical values, which constantly change. For example, an analog process is used at petrol pumps, which indicates the quantity of petrol delivered. Another example is speedometer of a car, etc.
3. Hybrid Computers:
These computers have useful features of both the digital and analog computers. For example, in intensive care unit (ICU) of hospitals, analog devices measure patient's blood pressure, temperature and other analog information. After that, measurements are converted into digits and then come into the digital components, which indicate the patient's vital symptoms. It helps sending signals into the computers in doctor's room to keep the doctor informed about the patient's condition.
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