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Showing posts from September, 2019

KIRCHOFF'S LAW

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1. Definition    Kirchhoff's laws quantify how current flows through a circuit and how voltage varies around a loop in a circuit. Kirchhoff's 1st law states that current flowing into a node (or a junction) must be equal to    current flowing out of it. This is a consequence of charge conservation. Kirchhoff's 2nd law states that the sum of all voltages around any closed loop in a circuit must equal zero. This is a consequence of charge conservation and also conservation of energy. 2. Formula Where: I stands for the electric current (A) Where: V stands for voltage (Volt) I stands for electric current (A) 3. Important Figure    Gustav Kirchhoff was a famous German physicist born in 1824. Gustav Kirchhoff studied mathematical physics at Albertus University of Konigsberg, graduating in 1847. In 1845, Kirchhoff extended Ohm's work by developing a method to understand and predict the behavior of much more complex circuits. Kirchhoff'

RESISTANCE AND RESISTIVITY

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1. Definition    The resistance of a component is a measure of the opposition an electric current experiences when it flows through the component. The resistance (R) of a component is the ration of the potential difference (V) across it to the current (I) flowing through it.    Aside from temperature, the resistance (R) of a conductor also depends on: Its length Its cross-sectional area (A) or thickness The type of material it is made of 2. Formula Resistance Formula Where: I stands for electric current (A) V stands for the potential difference (Volt) R stands for resistance (Ω) Resistivity Formula Where: R stands for resistance (Ω) ρ stands for resistivity (Ωm) A stands for cross sectional area (m²) L stands for length (m) 3. Important Figure    Georg Ohm (1789-1854) was a German physicist, he is best known for his "Ohm's Law" which states that the current flow through a conductor is directly proportional to the p

ELECTRIC CURRENT

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1. Definition    When electrons move, we say that an electric current is produced. An electric current is formed by moving electrons. Conventional current is in the direction opposite to electron flow. An electric current (I) is the rate of flow of electric charge (Q). 2. Formula Where: I stands electric current (A) Q stands for electric charge (C) t stands for the time taken (s)  3. Important Figure    Nikola Tesla (1856-1943) was a Serbian-American engineer and physicist who invented the first alternating current (AC) motor and developed AC generation and transmission technology. Though he was famous and respected, he was never able to translate his copious inventions into long-term financial success, unlike his early employer and chief rival, Thomas Edison. In the 1890s Tesla invented electric oscillators, meters, improved lights, and the high-voltage transformer known as the Tesla coil. 4. Uses in Everyday Life    Electric current can be seen

CAPACITOR CIRCUITS

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1. Definition   A circuit is any path along which electrons can flow. There are two types of circuits, one is the series circuit and the other is the parallel circuit.    When a capacitor is connected to a battery in a circuit, the electrons flow from the battery to the capacitor plate that is connected to the battery's negative terminal. The capacitor plate that is connected to the positive battery terminal does the opposite, it sends electrons back to the battery.  2. Formula and Example           Series Circuit Example:      Parallel Circuit Example: 3. Important Figure    The battery could produce a continuous flow of current, which made it possible for the development of the first electrical circuits. Alessandro Volta invented the first battery, the voltaic pile in 1800. The very first circuits used a battery and electrodes immersed in a container of water. Volta discovered he could produce a steady flow of electricity using bowls of