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Electronic circuits and components * Course Index * Introduction * About the Author * About this Course * Feedback * Course Navigation * How to use this Course * TINA * Locktronics Fundamentals * Introduction: Fundamentals * Units and Multiples * Electricity ## Conductors and Insulators ## Basic Circuit Symbols ## Voltage and Current ## Resistance ## Ohm's Law ## Worksheet: Ohm's Law ## Energy and Power ## Examples: Electricity * Electronic Principles * Electrical Circuits * Alternating Current * Assessment: Fundamentals Passive Components * Introduction: Passive Components * Resistors * Capacitors * Inductors * Transformers * Batteries, Fuses, Lamps and Switches * Assessment: Passive Components Semiconductors * Introduction: Semiconductors * Diodes * Transistors * Logic Gates * Assessment: Semiconductors Passive Circuits * Introduction: Passive Circuits * Series and Parallel Connections * Kirchoff's Laws * Potential and Current Dividers * Passive Time Variant Circuits * Assessment: Passive Circuits Active Circuits * Introduction: Active Circuits * Power Supply Circuits * Operational Amplifier Circuits * Transistor Amplifier Circuits * 555 Timer Circuits * Assessment: Active Circuits Parts Gallery * Introduction: Parts Gallery * Passive Component Images * Semiconductor Images * Other Images * Quizzes |
(:Summary:Contains the 'action' links (like Browse, Edit, History, etc.), placed at the top of the page, see site page actions:) (:comment This page can be somewhat complex to figure out the first time you see it. Its contents are documented at PmWiki.SitePageActions if you need help. :) * Print (:comment (:if group Site,SiteAdmin,Cookbook,Profiles,PmWiki*:) (:comment delete if and ifend to enable backlinks:) * %item rel=nofollow class=backlinks accesskey='$[ak_backlinks]'% [[{*$Name}?action=search&q=link={*$FullName} | $[Backlinks] ]] (:ifend:) :) * Login Energy and Power<^< Worksheet: Ohm's Law | Course Index | Examples: Electricity >^>(:nl:) At first you may be a little confused about the difference between energy and power. Energy is the ability to do work whilst power is the rate at which work is done. In electrical circuits, energy is supplied by batteries or generators. It may also be stored in components such as capacitors and inductors. Electrical energy is converted into various other forms of energy by components such as resistors (producing heat), loudspeakers (producing sound energy), and light emitting diodes (producing light). The unit of energy is the joule (J). Power is the rate of use of energy and it is measured in watts (W). A power of 1W results from energy being used at the rate of 1J per second. Thus: P = E / t where P is the power in watts (W), E is the energy in joules (J), and t is the time in seconds (t). The power in a circuit is equivalent to the product of voltage and current. Hence: P = I x V where P is the power in watts (W), I is the current in amps (A), and V is the voltage in volts (V). The formula may be arranged to make P, I or V the subject, as follows: P = I x V or I = P/V and V = P/I The relationship, P = I x V, may be combined with that which results from Ohm's law (V = I x R), to produce two further relationships. Firstly, substituting for V gives: P = I x (I x R) = I'^2^'R Secondly, substituting for I gives: P = (V / R) x V = V'^2^'/R (:nl:)(:table style="clear:both":)
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