Resistors.07.20.11
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Resistors come in fixed and variable types. Fixed resistors have their resistance printed on them or indicated by color code, while variable resistors called potentiometers have a wiper that can be moved between two terminals to vary resistance. The four band resistor color code provides the resistance value with the first three bands giving a number and the fourth indicating the tolerance.
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The microscope has evolved significantly since its earliest forms in the 1st century AD. Some key developments include:
1) The earliest microscopes in the 1st century AD had simple lenses that provided around 10x magnification.
2) In the late 16th century, experiments using multiple lenses in a tube led to improved magnification. Galileo later established the optical principles behind using lenses.
3) In the 17th century, Anton van Leeuwenhoek made tiny lenses that greatly increased magnification and allowed him to discover bacteria and microorganisms, while Robert Hooke used early microscopes to observe plant and animal cells.
Meiosis ppt
Meiosis is a type of cell division that produces gametes, or sex cells, with half the number of chromosomes as the original parent cell. It involves two rounds of division called Meiosis I and Meiosis II. In Meiosis I, homologous chromosomes pair up and may exchange genetic material through crossing over. The homologous chromosomes then separate, resulting in two daughter cells each with half the original number of chromosomes. Meiosis II then separates the sister chromatids, resulting in four gametes total with only one chromosome from each pair. This process of independent assortment and recombination during meiosis contributes greatly to genetic variation in offspring.
Asia
This document provides an overview of the geography and topography of Asia, including:
- Asia is bounded by the Arctic Ocean, Pacific Ocean, Indian Ocean, Red Sea, and Ural Mountains.
- It covers about a third of the world's landmass and spans 8,500 km from east to west.
- Major geographic features include mountain ranges like the Himalayas and Kunlun Mountains, rivers like the Ganges and Yangtze, and lakes like Baikal and the Caspian Sea.
- Environmental issues facing Asia include soil exhaustion, deforestation, and air pollution.
Tech.Skills.Capacitor.07.21.11
A capacitor is an electrical component that stores electric energy by separating two conducting plates with an insulating material called a dielectric. There are different types of capacitors that vary in size, plate arrangement, and dielectric material. Capacitors are used in applications like communications equipment, instruments, computers, and power supplies. The ability of a capacitor to store electric charge is measured in Farads, with the amount of stored charge being proportional to the applied voltage. Capacitors charge by allowing electrons to accumulate on plates when connected to a power source, and discharge the stored energy when connected to another circuit.
Mesopotamia
The document discusses the Mesopotamian civilization between rivers Tigris and Euphrates rivers from 4000 BC to 400 BC. It summarizes the Sumerian, Akkadian, Babylonian, Hittite, Phoenician, Hebrew, Assyrian and Chaldean civilizations that occupied the region. The Sumerians established the first cities and introduced cuneiform writing and irrigation. Later, the Akkadian and Babylonian empires united the city-states and trade flourished. The Hittites were the first to use iron and horse-drawn carts.
The land of the two rivers
The Sumerians established settlements in southern Mesopotamia in the 5th millennium BC that developed into major cities like Ur and Kish. They invented cuneiform writing and advanced arts, science, and agriculture. Sumerian cities were organized with farmland owned by temples and worked by groups of farmers. Around 2000 BC, both Sumer and Akkad fell to invaders, with the Elamites destroying Ur. Sargon of Akkad later united Sumer and Akkad into the first empire in Mesopotamia, though soil salinity and population decline weakened Sumerian dominance by the 2nd millennium BC.
The geography of asia
The document provides information about various countries and regions in Asia. It includes details about East Asia, Southeast Asia, South Asia, Central Asia, and the Middle East. It lists capital cities, populations, and some key facts about the geography, history, and economies of countries in these regions.
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