To establish connections between the computers using various networking devices (such as switches, hubs, nodes, satellites and workstations) the topologies like star, mesh, bus, ring, are used. The smallest addressable memory unit is a byte. While secondary memory (Hard disks, removable disk and tape drivers) is used to store the data that should be permanently stored such as systems data programs and other documents.
This type of memory content vanishes when the power goes off. Primary is used for storing temporary values for calculation processes where fast access or updating is required. But the memory in computers can exist in two forms that are primary and secondary. The amount of storage in computers can be variable and the capacity of the memory is increasing and size of the memory is decreasing by the evolution in the memory devices. This combination of electrical components provides a great speed of processing (can be in nanoseconds). A computer is made of various electronic components such as logic gates, capacitors, diodes, transistors, ICs and so on. Because the computer cannot perform operations, that an average child’s brain can execute, such as recognizing the handwritten patterns, different voices, inventing new things etcetera. But when we compare the human brain with a computer, it is far backward. It can perform numerous calculations within a second. Definition of ComputerĪ computer is a device (electronic) used to perform computations. To perform the above-given operations brains just need around 1800 calories while computers need more power.
When it comes to processing speed of the brain it is several 100 MIPS(Million computer instruction per second) which is less than a supercomputer, but the reason behind this is the enormous number of nerve cells and the interconnections between them, where the firing speed of the different neurons may vary. However, the information retrieval in the human brain is very complex where the relevant information is retrieved first then it is represented in any form. It keeps changing its topology and makes a new connection each time a person learns anything. The human brain does not follow any topology such as computer networks. But the storage power of the brain is infinite. It takes 200 billion neurons to store 1 byte of information. Our brain contains more than 125 trillion synapses where each neuron is connected to every 10000 or 100000 neurons. Synapse or neural junction transmits the electric neural impulses from one neuron to other. Neurons are the living cells used as the storage units in our brain, which are made up of Synapse. This whole process is achieved through neurons. It is a place where all the learned processes and things retained from the activities. The memory in the human brain is used to encode, retain, store, and consequently reminding information and past experiences. Our brain does several tasks simultaneously that are highly complex such as talking, breathing, listening, seeing, walking, imagining, thinking, smiling, touching, feeling, smelling, learning, taking the decision, monitoring.
It contains 100 billion neurons and about 10 12 synapses per cubic centimetre of the cortex. Uses chemicals to fire the action potential in the neurons.Ĭommunication is achieved through electrical coded signals.īrain is self-organizing, self-maintaining and reliable.Ĭomputers perform a monotonous job and can't correct itself.Ī human brain is a very sophisticated and abstract system. Variable weight and size form few grams to tons. The brain's volume is 1500 cm 3 and weight is around 3.3 pounds. Stored in numeric and symbolic form (i.e. Stored in electrochemical and electric impulses. Increases each time by connecting synaptic linksġ00 teraflops (100 trillion calculations/seconds)
ICs, transistors, diodes, capacitors, transistors, etc.