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DC vs. AC

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In the Current Electricity section, you learned about electric charge, current, voltage and other related topics. But, just because you have a voltage does not mean electric current will flow. Electrons also need a complete loop of conductive material to flow, called a closed circuit . Let's look at a light switch. When you turn the switch "on", the switch creates a path that conducts electricity and electrons start to move—meaning electric current flows—and the light turns on. As soon as you turn the switch "off", the path is broken and electrons can no longer flow. The switch is like a drawbridge; switching it on is letting down the bridge so the electrons can cross (just like cars crossing a bridge) and provide energy to the light bulb. Illustration of how electric current can move through a closed loop of conductive material (left figure) but stops flowing whenever the loop is broken (right figure). This figure shows how a light bulb l...
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Common Factor

Common Factor A common factor of two or more numbers is a number which divides each of them exactly. For example, 4 is a common factor of 8 and 12. Highest common factor Highest common factor of two or more numbers is the greatest number that divides each one of them exactly. For example, 6 is the highest common factor of 12, 18 and 24. Highest Common Factor is also called Greatest Common Divisor or Greatest Common Measure. Symbolically, these can be written as H.C.F. or G.C.D. or G.C.M., respectively Methods of Finding H.C.F. I. Method of Prime Factors Step 1 Express each one of the given numbers as the product of prime factors. [A number is said to be a prime number if it is exactly divisible by 1 and itself but not by any other number, e.g. 2, 3, 5, 7, etc. are prime numbers] Step 2 Choose Common Factors. Step 3 Find the product of lowest powers of the common factors. This is the required H.C.F. of given numbers. Illustration 1 Find the H.C.F. of 70 and 90. Solu...
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GROUP ONE MAIN EXAM SYALLABUS

Group I Services (Main Examination) PAPER – I ‐ General studies (Degree Standard) Descriptive type exam UNIT ‐ I . Modern history of India and Indian culture ‐ Advent of European invasion‐ Expansion and consolidation of British rule ‐ Effect of British rule on socio‐economic factors ‐ Social reforms and religious movements ‐ India since independence ‐ Characteristics of Indian culture ‐ Unity in diversity ‐ race, colour, language, custom ‐ India ‐ a secular state ‐ Organizations for fine arts, dance, drama, music ‐ Growth of rationalist, Dravidian movement in Tamil Nadu ‐ Political parties and populist schemes ‐ National renaissance ‐ Early uprising against British rule ‐ 1857 Revolt ‐ Indian National Congress ‐ Emergence of national leaders ‐ Gandhi, Nehru, Tagore, Netaji ‐ Growth of militant movements ‐Different modes of agitations ‐ Era of different Acts & Pacts ‐ World war & final phase struggle ‐ Communalism led to partition ‐ Role o...
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